Statistics and Probability questions and answers in June 2020

question attached. (b) Compute the first four moments about the mean from the following frequency distribution. Also calculate b, and b2 and use Charlier check. Group 2-4 4-6 6-8 8-10 10-12 12-14 14-1...

According to a study, the proportion of people who are satisfied with the way things are going in their lives is 0.76. Suppose that a random sample of 100 people is obtained. (a) Suppose the ra...

question attached. Question No 3 (CLO-2, C3, PLO-1 2+2) moments about (a) Prove the general formula connecting the moments about the mean with the r(r-1) 2! H 2 ( M; )' -...

Q. a. Show that the m.g.f of the sum of two independent r.v.s is the product of their m.g.f b. Six dice are thrown 729 times. How many time do you expect at least three dice...

Tell true or false : (i) The number of cats per 5 square kilometers in Karachi is a poisson rv. (ii) P ( z < 2.75 ) > 0.3. (iii) Binomial distribution consists of n Bernoulli rvs. (iv) Poisson p...

Find test statistics Find p value Answer in 10 minutes Consider the hypotheses below. Ho: H 2 55 Hy: H < 55 Given that x = 48.7, s = 14.7, n = 15, and a = 0.10, complete parts a and b below. a) Wha...

Thank you in advance :) A hacker is trying to guess someone's password. The hacker knows (somehow) that the password is 5 digits long, and that each digit could be a number between 0 and 4. Assume tha...

Let denote the life of a radio tube in months with probability density function f(x)=0.02e^-0.02x for x>=0 (i) Find the probability that the...

Q: A driver records the petrol consumed on a number of journeys of different lengths. The data is presented in the table below : Journey Length (miles) : 100 180 250 300 320 Petrol Consumption (gallon...

Let X have a uniform distribution on the interval (4, 13). Find the probability that the sum of 2 independent observations of X is greater than 24.

Q. Let A and B be two events associated with an experiment suppose that P(A) = 0.6 & P ( AUB)= 0.7 let P(B) = P. a. For what choice of P are A & B M.E For what choice of ...

Need help with this question. I do not understand. A presidential candidate plans to begin her campaign by visiting the capitals in 3 of 45 states. What is the probability that she selects the route o...

Q: What percent of data is not contained within 2.4 standard deviations about mean for a normal distribution?

Need help with this question. I do not understand. The data represent the results for a test for a certain disease. The data represent the results for a test for a certain disease. Assume one individu...

question attached. (b) Determine the co-efficient of correlation between traffic density and accident rate from the following information available. Traffic Density 30 35 40 45 50 60 70 80 90 Accident...

Need help with this question. I do not understand. Find the percentile corresponding to the data speed 11.7 Mbps. Use the following cell phone airport data speeds (Mbps) from a particular network. Fin...

Describe the sampling distribution of Modifying Above p with caret p. Assume the size of the population is 30,000. n= 400, p=0.2 Choose the phrase that best describes the shape of the sampling dist...

question attached. (a) Find more consistent performance of the two candidates X and Y at BA examination obtained the following marks in ten papers Papers I II III IV V VI VII VIII IX X X 58 49 76 80 4...

question attached. (b) Find 1" and 3" quartiles, 7" decile and 70* percentile of the weight of the 45 male students at a university are given in the following frequency distribution Wei...

Need help with this question. I do not understand. Listed below are amounts (in millions of dollars) collected from parking meters by a security service company and other companies during simi...

PLEASE HELP ME WITH THIS. PLEASE PLEASE PLEASE. THANKS A LOT! Page 1 > of 3 Psychology 210: Elementary Statistics One-Way Analysis of Variance SPSS Lab Lab Objectives: Participate in a modified exp...

For affine cipher, the key is a = 17, b = 10 so the enciphering function is C(7,1)(p) = 17p + 10 mod 26. a) Find the deciphering function for this cipher. Show your steps b) If the ciphertext is...

question is in the picture attached. (a) Find the geometric mean, harmonic mean, median and Mode of the following frequency distribution Weekly Income(Rs) 35-39 40-44 45-49 50-54 55-59 60-64 65-69 No ...

Suppose a simple random sample of size=1000 is obtained from a population whose size is N= 1,000,000 and whose population proportion with a specified characteristic is p=0.75. (a) Describe the samp...

ForRSAsystem,thepublickeyisn=pq,p=769,q=787,e=91. Whatisthe private key d (0 < d < (p − 1)(q − 1))? Show your steps of Euclidean algorithm.

If the normal concentration of copper in blood of llamas is 8.72 with a standard deviation of 1.3825, how many samples would have to be taken to detect a level of more than 10% above this level (that ...

Use graphical sensitivity analysis to determine the range of values of the probability of state of nature s 1 over which each of the decision alternatives has its largest expected value. State of N...

Students at Warlock High are allowed to sign up for one social studies class each year. The numbers in each grade level signing up for various classes for the next school year are given in the followi...

Need help with this question. I do not understand. Find the (a) mean, (b) median, (c) mode, and (d) midrange for the given sample data. Find the (a) mean, (b) median, (c) mode, and (d)...

A multiple-choice test contains 10 questions. Each question has five choices for the correct answer. Only one of the choices is correct. (a) What is the probability of making exactly 80% with rand...

Please answer all questions for a thumbs up good rating :)

Q1. a. Show that the m.g.f of the sum of two independent r.v.s is the product of their m.g.f b. Six dice are thrown 729 times. How many time do you expect at least three dice to show a five or s...

Q1. Let A and B be two events associated with an experiment suppose that P(A) = 0.6 & P ( AUB)= 0.7 let P(B) = P. (a.) For what choice of P are A & B M.E (b.) For what choice of P are A ...

B. P value Answer within 10 minutes thanks Consider the following hypotheses. Ho: ps0.25 Hy: p> 0.25 Given that p = 0.32, n = 150, and a = 0.05, answer the following questions. a. What conclusion s...

please tell me if i did the questions right Match the definitions & examples with the correct names. The group of units that you actually Data V measure. The entire collection of units or person y...

Let X have a uniform distribution on the interval (9, 18). Find the probability that the sum of 2 independent observations of X is greater than 28.

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In a particular area the statistics shows that for every 100 babies born, there were 6 more boys than girls. (a) If we were to randomly pick a child from that particular area, what is the probabil...

How do I calculate the UCL and the LCL? Sixty sampling units of equal size were inspected, and the number of nonconforming situations was recorded. The total number of instances was 502. Complete part...

Assume the data are in thousands of dollars. 173.1 171.2 141.9 112.6 211.1 156.5 145.4 134.0 192.0 185.8 168.3 131.0 214.4 155.2 164.9 123.9 161.9 162.7 178.8 161.3 182.0 165.8 213.1 177.4 159.3 The d...

Let X have a uniform distribution on the interval (9, 18). Find the probability that the sum of 2 independent observations of X is greater than 28.

The average cost at state universities in the U.S. was $4,260 in 2002. Suppose these costs are normally distributed with a standard deviation of $900. Suppose you take a sample of 50 state universitie...

According to a survey, people in a certain country ate an average of 208 208 meals in restaurants in 2001. The data in the accompanying table show the number of meals eaten in restaurants as deter...

The number of cell phones per 100 residents in countries in Europe is given in table #9.3.9 for the year 2010. The number of cell phones per 100 residents in countries of the Americas is given in tab...

How do I answer the first 4? The accompanying data show the number of miles driven per day by four taxi drivers for a taxi company. Control charts for the first 40 weeks show an issue in week 15, but ...

Please Help!!! 2. Suppose we have a bag of 25 marbles. 6 are blue, 3 are purple, 3 are green and the rest are yellow. Round your answer to three decimal places. Please show all work, including any for...

QUESTION 6 Find the regression equation, letting the diameter be the predictor (x) variable. Find the best predicted circumference of a beachball with a diameter of 39.1 cm. How does the result ...

The Sunshine Manufacturing Company has developed a unique new product and must now decide between two facility plans. The first alternative is to build a large new facility immediately. The second...

In a particular area the statistics shows that for every 100 babies born, there were 6 more boys than girls. (a) If we were to randomly pick a child from that particular area, what is the probabil...

The average rainfall for a week, excluding Sunday, was 10 cms. Due to heavy rainfall on Sunday, the average for the week rose to 15 cms. How much rainfall was on Sunday

Q1. Find the first four moments of Poisson distn p (x, µ) & hence prove that β1 = 1/µ β2 = 3+1/µ Q2. a. When gamma distn convert to exponential distn b. For the followin...

QUESTION 5 The data show the number of viewers for television stars with certain salaries. Find the regression equation, letting salary be the independent (x) variable. Find the best predicted...

Find probabilities with absolute values. l. 5 points Let the continuous random variable, X, have the following pdf: ﬂf2 .- : — — < ' C: HT) 24, 2 :r 4 (a) 3 points Find P(|X| :> 1}. (b) ...

discuss the considerations that determine the selection of a suitable average.Explain by giving an example one example of each case

Some researchers claim there is an association between getting a tattoo and contracting hepatitis C. They took a random sample of people living in Los Angeles, California, and recorded whether they ha...

please help Pennies made before 1983 are 97% copper and 3% zinc, whereas pennies made after 1983 are 3% copper and 97% zinc. Listed below are the weights (in grams) of pennies from each of the two tim...

Proteins are made up of chains of amino acids. Insulin is a relatively small protein with 53 amino acid residues. How many possible proteins of length 53 can be made with 20 possible amino acids for...

Levi-Strauss Co manufactures clothing. The quality control department measures weekly values of different suppliers for the percentage difference of waste between the layout on the computer and the a...

The number of cell phones per 30 residents in countries in Europe is given in table C for the year 2010. The number of cell phones per 30 residents in countries of the Americas is given in table D al...

Could you work a problem for me so I can see the steps?

A study was conducted that measured the total brain volume (TBV) (in ) of patients that had schizophrenia and patients that are considered normal. Table A contains the TBV of the normal patients and ...

Please explanation of these questions 3. Engineers must consider the breadths of male heads when designing motorcycle helmets. Men have head breadths that are normally distributed with a mean of 6.0 i...

What proportion of all American adults live alone? Should this research question be addressed using a confidence interval or hypothesis test? Explain why.

For a summer job, you were working in the quality control department for a computer company that manufactures computer parts. The specific part that you are to evaluate the quality of is supposed to...

What conclusion should be drawn? Does changing the value of a from .05 to .01 affect your conclusion? Why or why not? P Value? Please answer all these within 10 minutes thanks During the winter of 200...

Catch a ruler 10 times and note where you caught it. 3 attempts: "5" 4 attempts: "7" 2 attempts: "3" 1 attempt: "9" a) What is the mean of the location where you caught the ruler? b) What is the stand...

Does your organization, or an organization with which you are familiar, use a statistical analysis tool? If so, what do they use and why? If not, also explain why. If SAS is not being used by your org...

Confidence intervals and p-values are commonly used in business decision making. Identify at least two business journals (or articles) that have used confidence intervals and/or p-values. For each j...

i just need the answer with a quick explanation would be most helpful thanks ' ' Homework Q-2: Two 4-sided dice are rolled where each has the values 1, 2, 3, and 4. The sum of the values is added ...

The net contents in ounces of canned soup is a random variable with probability distribution. Find the probability that a can contains less than 12 ounces of product. Use your knowledge of integration...

If I can get help with the question below with a quick explanation I Homework Q-l: You play the following game. It cost $1.00 to play. If you win you get back the dollar plus your winnings. If you los...

You are the regional marketing vice president overseeing all US marketing for an international pharmaceutical distributor. Your team has recently submitted a proposed budget for advertising and marke...

What conclusion should be drawn? B. P value Please answer in 10 minutes thanks Consider the following hypotheses and sample data, and then complete parts a and b below using a = 0.10. Ho: HS 15 Hy: H ...

In Hannah's purse there are three 1p coins, five 10p coins and eight 2p coins. She takes a coin at random from her purse. What is the probability of: (a) a 1p coin (b) a 2p coin (c) not a 1p coin ...

Question 3,4,5 Question 3 6 out of 6 points A rectangular city zone measuring 12 miles by 16 miles contains five buildings. What is the maximum distance separating each building from the others? (Inpu...

6)What type of questions are used to collect data? Research Measurement Investigative Management dilemma 7)A researcher wants to use interviews as well as a survey as part of their data colle...

1. Do survey participants who have different IT roles (Q1) differ in terms of dimensions of overall measures (Q4-Q7) when these variables are considered simultaneously? Since there are no val...

A large company has analyzed the amount of time required to produce a widget and determined that the times follow a normal distribution with mean time μ = 45 hours. The boss has developed a new p...

B. P-Value Please answer this thanks within 10 minutes Suppose the coffee industry claimed that the average adult drinks 1.8 cups of coffee per day. To test this claim, a random sample of 50 adults wa...

Please answer these 3 questions 2. FIRST LEGO League is a fun STEM activity for elementary and middle school children which involves a robot game where small LEGO robots perform autonomous missions. S...

I need to upload csv into an R Reader and the only platform I have is the online version. How would I go about uploading it into https://rdrr.io/snippets/

The Sunshine Manufacturing Company has developed a unique new product and must now decide between two facility plans. The first alternative is to build a large new facility immediately. The second...

Simple random sampling uses a sample of size n from a population of size N to obtain data that can be used to make inferences about the characteristics of a population. Suppose that, from a po...

Please answer this question Consider the hypotheses shown below. Given that x = 60, o = 13, n =37, a =0.10, complete parts a and b. Ho: HS 58 H1: H > 58 a. What conclusion should be drawn? b. Deter...

A large company has analyzed the amount of time required to produce a widget and determined that the times follow a normal distribution with mean time μ = 45 hours. The boss has developed a new p...

1(b). Use PEMDAS to evaluate the following. [(-3)^3+(-2)^3]+12/4+3

what would happen if a z-score exceeded the critical value? What would we then call the value and ultimately do with this data point?

A pollster wants to construct a 95% confidence interval for the proportion of adults who believe that economic conditions are getting better. A Gallup poll taken in July 2010 estimates this proportion...

HELP ASAP!! Sam buys a bag of cookies that contains 9 chocolate chip cookies, 9 peanut butter cookies, 8 sugar cookies and 7 oatmeal raisin cookies. What is the probability that Sam randomly selects a...

A researcher wants to construct a 99% confidence interval for the proportion of people who changed jobs in the past year. What sample size is needed so that the confidence interval will have a margin ...

Teaching descriptive statistics. A study compared five different methods for teaching descriptive statistics. The five methods were traditional lecture and discussion, programmed textbook instructio...

A stationary store has decided to accept a large shipment of ball-point pens if an inspection of 16 randomly selected pens yields no more than two defective pens. (a) Find the probability that this ...

The income of males in each state of the United States, including the District of Columbia and Puerto Rico, are given in table E and the income of females is given in table F. Is there enough evidenc...

Individual taxi fares in Metro City are normally distributed with a population mean equals to $10 and a population standard deviation of $4. Assume drawing from an infinite population, a random sam...

The British Department of Transportation studied to see if people avoid driving on Friday the 13 th . They did a traffic count on a Friday and then again on a Friday the 13 th at the same two locat...

ll Fresh Seafood is a wholesale fish company based on the east coast of the U.S. Catalina Offshore Products is a wholesale fish company based on the west coast of the U.S. Table M contains prices fro...

A group of students had their heights determined during their annual physicals. The mean height for the students was 68 inches. The standard deviation was 4 inches. What is the percentage of: -Student...

1. A psychologist thinks that listening to Bach helps people think. She gives subjects a set of puzzles and measures the highest level they solved while listening to Bach. From data on many peo...

The economic crisis of 2008 affected many countries, though some more than others. Some people in Australia have claimed that Australia wasn't hurt that badly from the crisis. The bank assets (in bi...

Are there more children diagnosed with Autism Spectrum Disorder (ASD) in states that have larger urban areas over states that are mostly rural? In the state of Pennsylvania, a fairly urban state, the...

(b). Mr. Roland who is your teacher has his grading system in his Math class as follows. Homework Average = 25% Class Participation = 10% Test Average = 40% Final Exam Grade ?...

Many high school students take the AP tests in different subject areas. In 2007, of the 144,796 students who took the biology exam 84,000 of them were female. In that same year, of the 211,693 stude...

4. (a). The following are the 10 scores of a student in 10 weeks on a Math test in his class. 65, 87, 85, 55, 89, 75, 91, 75, 96, 80 (i)....

I have been trying to get probable error for single measurement. I found probable error formula 0.6745 ×segma but I still get high coefficient value around (500). I need help here please

A study was undertaken to see how accurate food labeling for calories on food that is considered reduced calorie. The group measured the amount of calories for each item of food and then found the ...

3. Three friends, Tom , Jerry and Mark Shared an amount of money such that Tom's share was 3 times as much as Jerry's share and Mark's share was 2 times as much as Jerry's share. (a). Write in the rat...

Create a PowerPoint presentation (that includes slides and speaker notes) that presents your understanding of the purpose of educational research. Follow the introductory slide, which stated the purpo...

2. Jack borrowed an amount of $250, 000.00 from his Bank at an interest rate of 6.5% for 10 years. Calculate the Amount and interest he is supposed to pay under the following conditions. (a). Compound...

18) (6 points) The Sunshine Manufacturing Company has developed a unique new product and must now decide between two facility plans. The first alternative is to build a large new facility immediately....

Table #2.3.7 contains the value of the house and the amount of rental income in a year that the house brings in ("Capital and rental," 2013). Create a scatter plot and state if there is a relationshi...

how can I summarize this regression output to reject or accept the null hypothesis? statsfir Capella @ Home Bb Assess @ Decidii Bb Thread |G: x b Adding M Reset) | Capell: | Course @ How to > Inter...

Discuss the concepts of hypothesis testing, including what you are evaluating, when it should be used and the differences between a one and a two-tailed test. Describe an example from your own person...

The file "flowers.csv" file contains information on measurements of the iris flowers. Create an R data frame by the name "flower.data" that contains the data in the file. The following R code shows an...

QUESTION 1(10 MARKS) -CLO1 You are appointed as a market researcher by a renowned restaurant in Shah Alam to make a brief survey reports about the distribution prices of Durian sold in the two markets...

Suppose that a researcher wants to explore whether there is a linear relationship between price(in dollars) and their mileage(in miles) of used Porsche sports cars . To investigate the relationship, h...

Please answer these 4 questions 6. Radioactive atoms are unstable because they have too much energy. When they release that extra energy, they are said to decay. When studying cesium- 137, a nuclear e...

Thank you in advance:) The IQ scores of 50 students are given below. 105 87 116 94 92 119 112 94 102 91 107 107 102 93 93 108 85 111 116 90 98 106 114 105 113 111 94 100 86 110 106 86 96 113 96 91 112...

A medical researcher wants to construct a 99% confidence interval for the proportion of knee replacement surgeries that result in complications. An article in the Journal of Bone and Joint Surgery ?...

Thanks in advance :) The five number summary of a dataset was found to be: 46, 52, 60, 64, 69 An observation is considered an outlier if it is below: An observation is considered an outlier if it is a...

A study was conducted that measured the total brain volume (TBV) (in ) of patients that had schizophrenia and patients that are considered normal. Table #9.3.5 contains the TBV of the normal patie...

Find the probabilities 1. A large national retailer of electronics conducted a survey to determine consumer preferences for various brands of digital cameras. The table summarizes responses by brand a...

Thank you in advance :) Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the z-score ons of a man who is 63.9 inches tall. (to 4 decimal places) > Next...

The income of males in each state of the United States, including the District of Columbia and Puerto Rico, are given in table #9.3.3, and the income of females is given in table #9.3.4 ("Median incom...

I need help to solve my homework al Displays of Quantitative Data Score: 0 of 1 pt 4 of 6 (5 complete) X 2.3.11 The data in the table represent the tuition for all 2-year community colleges in a regio...

Please fill in all 3 boxes. :) AND would this data be Quantitive or qualitative? In California, we need more rain to sustain the health of our natural environment, argriculture, and economic. A group ...

Assume that females have pulse rates that are normally distributed with a mean of μ=72.0 beats per minute and a standard deviation of σ=12.5 beats per minute. a. If 1 adult female is randomly sel...

The British Department of Transportation studied to see if people avoid driving on Friday the 13th. They did a traffic count on a Friday and then again on a Friday the 13th at the same two locatio...

Given the following GPA for 4 students: 2, 3, 3, 4. Age of students are: 10, 11, 12, 15. There are 10,000 total students. Average GPA: Unknown, Standard Deviation of GPA: 0.02 and it's Normal. ...

What distribution are you using and why ? 5. The television show NBC Sunday Night Football broadcast a game between the Colts and Patriots and received a share of 22, meaning that amount the TV sets i...

Please answer all 4 boxes :) This data is from a sample. Calculate the mean, standard deviation, and variance. X 26.2 41 13.5 33.7 17.1 48.8 16.4 24.7 Please show the following answers to 2 decimal pl...

Suppose x has a distribution with a mean of 50 and a standard deviation of 3. Random samples of size n = 36 are drawn. (a) Describe the xbar distribution and compute the mean and st...

In its January 25, 2012, issue, the Journal of the American Medical Association (JAMA) reported on the effects of overconsumption of low, normal, and high protein diets on weight gain, energy expe...

Suppose our baseball team is equally likely to win any particular game as not to win suppose also that we choose a random sample of 20 games 1. Estimate the number of games in the sample that we win b...

1. Find the standard deviation of the values: 5, 8, 3, 2

Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 70 tons of coal into each car. The actual weig...

In the following problem, check that it is appropriate to use the normal approximation to the binomial. Then use the normal distribution to estimate the requested probabilities. It is known that 80%?...

A large company has analyzed the amount of time required to produce a widget and determined that the times follow a normal distribution with mean time μ = 45 hours. The boss has developed a new p...

It is believed that the impact of two soil treatments: Clay soil and Sandy soil, affect the growth of plants in different ways. To test this claim, a plant biologist randomly assigns 20 seedlings to e...

agregando un 2 valores mas siendo 12, 12, 14, 14, 16 y 18. las respuestas de los 3 incisos

A certain flight arrives on time 86 86 percent of the time. Suppose 199 199 flights are randomly selected. Use the normal approximation to the binomial to approximate the probability that (a) exact...

52% of their customers order their food to go suppose the proportion is correct and that a random sample of 40 individual customers is taken 1. Estimate the number of customers in the sample who order...

A study was conducted on 64 female college athletes. The researcher collected data on a number of variables including percent body fat, total body weight, lean body mass, and age of athlet...

Hello, can you please correct me? My solution is wrong. Thank you ! X = Exi - 109 n = 18.1666 18.17 sa= n-1 E (vi - 7) 2 7 (25 - 18:17) + (a2- 18.17 ) + (17-18:17) + ( 20- 1817)"+ (15- 18.17) + (...

Please help and will appreciate and explanation. Thank you. 1. Sam and Alex are arguing about probability. Sam thinks that he can use the Normal distribution anytime he likes, provided he has the mean...

Hello, can you please correct me? My solution is wrong. Thank you ! 15: In a manufacturing process a random sample of 9 manufactured bolts has a mean length of 3 inches with a standard deviation of .3...

The following contingency tables was created from a study about malaria. Remember to show your work or email it to me for partial credit. Malaria Gender Yes No Total Male 90 70 160 Female 60 80 140...

16.The histogram shown below relates to a study undertaken by Baker et al. (2003) of the impact of roster changes on absenteeism and incident frequency in an Australian coal mine. The average monthly ...

11.Which of these is not related to the model sum of squares? a.The variance explained by the first predictor/independent variable b.The variance explained by the second predictor/independent variable...

Hello, can you please correct me? My solution is wrong. Thank you ! 7: Find P( X < 500), If / = 498, ox = 150, and n = 100. O Z = x- M 5517 P ( X< 500 ) 6x/Jn XO None of the answers are correct ...

Let X be a random variable woth following probability distribution Value of X. P X=x 4. 0.25 5. 0.20 6. 0.25 7. 0.05 8. 0.20 9. 0.05 Find the expectation E(x) = Var (X) =

6.An experiment was done to look at whether there is an effect of the number of hours spent practising a musical instrument and gender on the level of musical ability. A sample of 30 (15 men and 15 wo...

Assume that the speed of male cyclists on a city cycling trail is normally distributed with a mean of 20 Km/h and a standard deviation of 5 Km/h. Note: You may use the following R commands and results...

In a sample of 42 water specimens taken from a construction site, 16 contained detectable levels of lead. What is the upper bound for the 90% confidence interval for the proportion of water specimens ...

A person with a cough is a persona non grata on airplanes, elevators, or at the theater. In theaters especially, the irritation level rises with each muffled explosion. According to Dr. Brian Carl...

1. The national mean annual salary for school administrator is $90,000 a year (The Cincinnati Enquirer, April 7, 2012). A school official took a sample of 25 school administrators in the state ...

Value of X be a random variable with following probability distribution Value of x. P(x=x) 0. 0.10 10. 0.20 20. 0.10 30. 0.15 40. 0.30 50. 0.15 E(x) = Var (X) = Find the expectation of E and X

An outpatient clinic that is open two hundred days a year receives 6000 visits per year or approximately 30 patients per day. The clinic is open for 6 hours per day. Administrative staff is responsibl...

To open a combination lock, you turn the dial to the right and stop at a number; then you turn it to the left and stop at a second number. Finally, you turn the dial back to the right and stop at a th...

In 1970 Linus Pauling, a well-known chemist and Nobel Prize winning scientist, published Vitamin C and the Common Cold (1970), creating a great deal of public and scientific interest. In short, Paulin...

Assume that when adults with smartphones are randomly selected, 47% use them in meetings or classes. If 10 adult smartphone users are randomly selected, find the probability that fewer than 5...

Hospitals typically require backup generators to provide electricity in the event of a power outage. Assume that emergency backup generators fail 4444% of the times when they are needed. A hospital...

In a recent poll, 45 45% of survey respondents said that, if they only had one child, they would prefer the child to be a boy. Suppose you conducted a survey of 130 130 randomly selecte...

Let X be a random variable following probability distribution X 30. P 0.25 X 40. P 0.10 X 50. P 0.10 X 60. P 0.10 X 70. P 0.30 X 80. P 0.15 E(x) expectation find variance (X) E(x) = Var (X) =

Scenario: A study has results that seem fine, but there is no clear association to social change. What is missing? A correlation test was conducted to determine whether a relationship exists between l...

The ABO blood group system consists of four different blood groups, which describe whether an individual's red blood cells carry the A antigen, B antigen, both, or neither. The ABO gene has three alle...

Elaborate on what the difference is between these tests (The Kruskal-Wallis Test, Wilcoxon Signed-Ranks Test, The sign test) and the ones we've already been doing (estimation and hypothesis testing, c...

Suppose you are helping the police develop a new test for blood alcohol levels. The potential advantage of the test is that it can be used during a routine traffic stop, but neither you nor the police...

Consider the Standard Normal distribution. The mean is always ---------- and the standard deviation is always---------- .

The weekly mean income of a group of executives is $3,000 and the standard deviation of this group is $300. The distribution is normal. What percent of the executives have an income of $2,700 or less?...

The annual commissions per salesperson employed by a manufacturer of light machinery averaged $40,000 with a standard deviation of $5,000. What percent of the sales persons earn between $35,000 and $4...

P (X=x) values in table give a legitimate probability distribution for the discrete random variable X find the answers that are missing in the table 0. 0.30 2. ? 3. ? 4. 0.23 6. 0.15

The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds. What is the area between 410 pounds and the mean of 400 pounds? Group of answer choices 0.5000 0.4332 0.3413 0.477...

20 socks, 10 black and 10 white. i need help with the probability problems now. What is the probability of picking either a pair of white socks or a pair of black socks? 10/20 * 9/19 = 0.5 * 0.474 = ...

P(X=x) value table give legitimate probability distribution for the discrete random variable X 1.-5. ? 2. -1. 0.20 3. 2. 0.22 4. 4. 0.23 5 6. ?

#8: Split the dataframe Q8 into a training sample (75%) and holdout sample (25%). Build a predictive logistic regression model predicting Buy from all predictors (no interactions), choosing as your ?...

#11: Reconsider your model and data from Q10. Now impose an autoregressive model on the residuals. In other words, consider three additional models predicting Sales from Quarter and Month (no interac...

#9: Build a partition model predicting Buy on the training set you made in #8. Copy/ paste the value of cp corresponding to the tree suggested by the one standard deviation rule. Again, in the place(...

-1. ? 2. ? 3. 0.10 4. 0.16 6. 0.13 P(X=x) values in table give legitimate probability distribution for the discrete random variable X

#10: Use the Q10 dataframe. Consider three standard multiple linear regression models predicting Sales from both predictors and no interaction (i.e., ignoring the time series nature of the data): one...

#7: Use the Q7 dataframe. You want a 'good' model predicting Wins from all variables (without interactions). Perform the 'all possible' approach, which produces a list of models with whose Ale are ...

A binomial experiment consists of 15 trials. The probability of success on trial 8 is 0.13. What is the probability of success on trial 12?

Suppose you were interviewing people about their views on gun control. You ask the respondents the following question: How much do you agree or disagree with this statement, The United States needs st...

A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what ...

1 / 1 Mixed Practice Problems 1. An instructor is interested in finding out how the number of patients in OPD on a given day is related to the mean temperature that day. A random sample of 10 days wa...

If stocks lie between 8/9 and 89% relative increase in socks by what round to 2 decimal places

There is money to send four of seven city council members to a conference in Honolulu. All want to go, so they decide to choose the members to go to the conference by a random process. How many di...

The average one-bedroom rent per month in Lincoln, Nebraska is $500 with a standard deviation of $75. Assuming that such rents are normally distributed, what is the probability that a one-bedroom is?...

A Chinese solar panel manufacturer discovered that the distribution of the lengths of time it takes an assembly worker to assemble a batch of solar panels is normally distributed with a mean of 32 h...

A random sample of 46 adult coyotes in a region of northern Minnesota showed the average age to be xbar = 2.03 years, with sample standard deviation s = 0.78 years. However, it is though...