Quiz_03B
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Quiz_03B

Course Number: STAT 200, Fall 2010

College/University: Penn State

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Unit Quiz 03 https://cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=74F41B758B0... Points Awarded Points Missed Percentage 13.00 2.00 86.7% 1. In the past five years, only 5% of pre-school children did not improve their swimming skills after taking a Beginner Swimmer Class at a certain Recreation Center. Decide if the probability described is a subjective (personal) probability or a...

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Quiz Unit 03 https://cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=74F41B758B0... Points Awarded Points Missed Percentage 13.00 2.00 86.7% 1. In the past five years, only 5% of pre-school children did not improve their swimming skills after taking a Beginner Swimmer Class at a certain Recreation Center. Decide if the probability described is a subjective (personal) probability or a relative frequency probability: The probability of 5% that a pre-school child who is taking a Beginner Swimmer Class swim class will not improve his/her swimming skills is a A) subjective probability. B) relative frequency probability. Points Earned: 1.0/1.0 2. A statistics class has 4 teaching assistants (TAs): three female assistants (Lauren, Rona, and Leila) and one male assistant (Josh). Each TA teaches one discussion section. A student picks a discussion section. The two events W = {the TA is a woman} and M = {the TA is a man} are A) independent events. B) d isjoint (mutually exclusive) events. C) each simple events. D) none of the above Points Earned: 1.0/1.0 3. Students who live in the dorms at a college get free T.V. service in their rooms, but only receive 6 stations. On a certain evening, a student wants to watch T.V. and the six stations are broadcasting separate shows on baseball, football, basketball, local news, national news, and international news. The student is too tired to check which channels the shows are playing on, so the student picks a channel at random. The two events A = {the student watches an athletic event} and N = {the student watches a news broadcast} are A) independent events. B) d isjoint (mutually exclusive) events. C) each simple events. D) None of the above. Points Earned: 1.0/1.0 1 of 4 9/27/2010 11:16 PM Unit Quiz 03 https://cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=74F41B758B0... 4. Students who live in the dorms at a college get free T.V. service in their rooms, but only receive 6 stations. On a certain evening, a student wants to watch T.V. and the six stations are broadcasting separate shows on baseball, football, basketball, local news, national news, and international news. The student is too tired to check which channels the shows are playing on, so the student picks a channel at random. On a different night, two students who dont know each other each choose a channel this way. The two events, N = {the first student watches a news broadcast } and F = {the second student watches football} are A) independent events. B) d isjoint (mutually exclusive) events. C) each simple events. D) None of the above. Points Earned: 1.0/1.0 5. Lauren wants to wear something warm when she leaves for class. She reaches into her coat closet without looking and grabs a hanger. Based on what she has in her coat closet, she has a 30% chance of picking a sweater, a 50% chance of picking a coat, and a 20% chance of picking a jacket. What is the probability that she will pick a sweater or a coat? A) 15% B) 30% C) 50% D) 80% Points 1.0/1.0 6. Earned: A standard 52-card deck is shuffled and 2 cards are picked, without replacement, from the top of the deck. The probability that the both cards are Hearts is A) 6.3% B) 5.76% C) 5.88% D) 25.0% Points Earned: 1.0/1.0 7. Two standard 52-card decks are shuffled and two cards are picked at random, one card from each deck. The probability that two Hearts are drawn is A) 5.9% B) 6.25% C) 25.0 % D) 50.0% Points Earned: 1.0/1.0 8. 2 of 4 9/27/2010 11:16 PM Unit Quiz 03 https://cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=74F41B758B0... A student doing an internship at a large research firm collected the following data, representing all of the studies the firm had conducted over the past 3 years. Define the events E = {the study was an experiment}, U = {the study used randomization} and R = {the study was a retrospective observational study}. Which of the following sets of events are disjoint? A) E and U B) E and R C) U and R D) All three E) None of the above Points Earned: 1.0/1.0 9. For the following statement, determine if it is true or false. If events A and B are known to be independent and P(A) = 0.2 and P(B) = 0.3, then P(A and B) = 0.5. A) True B) False Points Earned: 1.0/1.0 10. For the following statement, determine if it is true or false. If events D and E are known to be mutually exclusive, then P(D|E) = 0. A) True B) False Points Earned: 1.0/1.0 11. A short quiz has two true-false questions and one multiple-choice question with four choices. A student guesses at each question. Assuming the choices are all equally likely, what is the probability that the student gets all three correct? A) 1/32 B) 1/3 C) 1/8 D) 1/16 Points Earned: 1.0/1.0 12. If events A and B are mutually exclusive (disjoint) then A) they must also be independent. B) they cannot also be independent. 3 of 4 9/27/2010 11:16 PM Unit Quiz 03 https://cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=74F41B758B0... C) they must also be complements. D) they cannot also be complements. Points Earned: 1.0/1.0 13. Which of the following is the sample space when 2 coins are tossed? [H = Head, T = Tail] A) {H, T, H, T} B) {H, T} C) {HH, HT, TH, TT} Points Earned: 1.0/1.0 14. Three playing cards, without replacement, are chosen at random from a standard 52-card deck. What is the probability of getting an Ace, a King and a Queen in that order? A) 8/16575 B) 1/2197 C) 6/35152 Points Earned: 0.0/1.0 15. According to the Penn State Fact Book [University Park], approximately 55% of first year students graduate in 4 years (this is based on the average of those full-time first-year students from 1999 and 2000 who graduated in 4 years) and the percentage of first-year full time undergraduate female students for Fall 2005 is approximately 45%. If a freshman student from last fall is chosen at random, what is the probability that the student is a female and will graduate in four years? A) 25% B) 100% C) 50% Points Earned: 0.0/1.0 4 of 4 9/27/2010 11:16 PM

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Penn State - STAT - 200
Unit Quiz 04https:/cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=FA12CE6394B.Points Awarded Points Missed Percentage15.00 1.00 93.8%1. Suppose that a student needs to buy 10 books for her history course. The number of books that s
Penn State - STAT - 200
Unit Quiz 04https:/cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=FA12CE6394B.Points Awarded Points Missed Percentage12.00 4.00 75.0%1. Suppose that a student needs to buy 6 books for her history course. The number of books that sh
Penn State - STAT - 200
Unit Quiz 05https:/cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=A60882BCEC1.Points Awarded Points Missed Percentage10.00 1.00 90.9%1. When a random sample is to be taken from a population and a statistic is to be computed, the st
Penn State - STAT - 200
Unit Quiz 05https:/cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?entryId=A60882BCEC1.Points Awarded Points Missed Percentage8.00 3.00 72.7%1. Which of the following statements is true about a parameter and a statistic for samples taken fr
Penn State - STAT - 200
Unit Quiz 06https:/cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?en.Submitted by LUNBURG, ERIK (exl5087) on 10/7/2010 12:57:06 AM Points Awarded Points Missed Percentage 10.00 5.00 66.7%1. Which theorem or law is correct for supporting the
Penn State - STAT - 200
Unit Quiz 06https:/cms.psu.edu/Section/Assessment/Question/GradeDelivery.aspx?ent.Points Awarded Points Missed Percentage13.00 2.00 86.7%1. Which theorem or law is correct for supporting the notion that as sample size increases the distribution of the
Penn State - STAT - 200
Complement, Independence, Mutually Exclusive Complement and Mutually Exclusive Consider a course where, if completed, you can receive one of the following letter grades: A, B, C, D, or F and each has an equal probability of occurring. That is, P(A) read p
Penn State - STAT - 200
All confidence intervals follow the same formula: Sample Statistic +/- Multiplier*Standard Error For example in problem 7.25 on page 343 since we are talking about a 95% confidence interval to estimate a population mean the above formula would consist of:
Penn State - STAT - 462
Finding P-values For hypothesis testing for proportions were we calculate a Z test statistic (Ill call it Zstat) and for testing means we use a t test statistic (Ill call it tstat). Finding the p-value (or probability value) is based on the alternative hy
Penn State - STAT - 500
Probability Independence and Test of Two Categorical Variables The idea of independence between two categorical variables may sound familiar as we spoke of independence when we discussed probability. Recall that in that lesson we stated that two events, c
Penn State - STAT - 500
Variances, N vs N-1 (1995) Seal.<- file 95varqn.html -> . divide by N or N-1 for variance? Seal =David Seal, 06 Nov 1995=ssm, .From: dseal@armltd.co.uk (David Seal)Newsgroups: sci.math.num-analysis,sci.math,sci.stat.mathSubject: Re: What's Standard D
Penn State - STAT - 200
SOLUTIONS TO ACTIVITY SET 8Activity 8.1 Suppose the amount students at PSU spent on textbooks this semester is a normal random variable with mean = $360 and standard deviation = $90.a. Use the empirical rule for bell-shaped data to determine intervals t
Penn State - STAT - 462
Solution to Homework 1 The following data were collected for a class of 20 students on reading readiness stanines (X) at the end of kindergarten and reading achievement stanines (Y) at the end of first grade. You want to examine how well the readiness sco
Penn State - STAT - 462
Solution - Homework 2 Use the data from Homework 1 to complete this assignment and regress Y on X and store the residuals. 1. Create boxplots for both X and Y. Are there any outliers? No outliers identified. See boxplot below.Box pl ot of X, Y0 X 2 4 Y
Penn State - STAT - 462
Homework 3 - Solutions Covers Chapters 5 and 6 Matrix Methods 1. Using the data for Homework 1 and 2, write in proper matrix form, the matrices for Y, and X. 3 1 1 3 5 4 7 6 7 8 Y = 5 2 7 6 9 8 4 6 9 7 1 1 1 1 1 1 1 1 1 1 X = 1 1 1 1 1 1 1 1 1 1 2 2 1 1 3
Penn State - STAT - 462
Homework 4 Covers Chapters 7 Use the Project Talent data set. 1. Perform a multiple regression by regressing Math on Gender, SES, Sociability, Reading, and Mechanical Reasoning entering the predictors in this order. a. What is the interpretation of the t-
Penn State - STAT - 462
Homework 5 Covers Chapter 8 Use the Project Talent data set. The variable School Size is interpreted as follows: 1 = number of students is less than 100 2 = number of students is from 100 to 399 3 = number of students is 400 or more 1. A lack-of-fit test
Penn State - STAT - 462
Homework 6 Covers Chapters 9 and 10 Use the High School and Beyond (HSB) data set. The data is explained in the HSB Read Me file. USE MATH AS PREDICTOR 1. Some researchers feel an interaction exists between Gender and Writing ability. Create an Gender*Wri
Penn State - STAT - 500
STAT500 HW#2_solutionsSolutions to Homework 2 1) (fifth) a) A=cfw_6 n(A) / n(S) = 1/6 b) B=cfw_2,4,6 n(B) / n(S) = 3/6=1/2 c) C=cfw_3,4,5,6 n(C) / n(S) = 4/6=2/3 d) D=cfw_4,6 n(D) / (S)=2/6=1/3 (sixth) a) A=cfw_6 n(A) / n(S) = 1/6 b) B=cfw_1,3,5 n(B) / n
Penn State - STAT - 500
Stat 500 Homework 3 SolutionsSTAT500 HW#3 Solutions1) Random sample of 25 generated without replacement from Minitab (Will most likely differ from yours):2 240 125 409 783 526 219 364 584 789 84 341 296 652 134 708 104 155 21 562 378 522 86 667 4282)
Penn State - STAT - 500
STAT500 HW#4_solutionsSTAT500 HW#4 Solutions1) a) 95% T Confidence IntervalsVariable speed 10.304) N 20 Mean 9.100 StDev 2.573 SE Mean 0.575 95.0 % CI (7.896,b) The normal probability plot for reading speed suggests no reason to believe that the data
Penn State - STAT - 500
STAT500 HW#5_solutionsSTAT500 HW#5 Solutions1) Chicago Title Company problem T 0 = 0.831; because nT 0 = 2544*(0.831) = 2114.1 > 5, n*(1 - T 0) = 2544*(1 0.831) = 429.9 > 5, thus the one-proportion z-test can be used. Ho: = 0.831; Ha: 0.831 = 0.024; two
Penn State - STAT - 500
STAT500 HW#6_solutionsHomework 6 Solutions1. a. This poses an interesting question since we never discussed intuitive decisions prior to performing an analysis. So here is an intuitive thought process. Since one assumption is that the each population fo
Penn State - STAT - 500
Solution to Homework 1 The following data were collected for a class of 20 students on reading readiness stanines (X) at the end of kindergarten and reading achievement stanines (Y) at the end of first grade. You want to examine how well the readiness sco
Penn State - STAT - 500
Solution to Homework 1 The following data were collected for a class of 20 students on reading readiness stanines (X) at the end of kindergarten and reading achievement stanines (Y) at the end of first grade. You want to examine how well the readiness sco
Penn State - STAT - 200
Solutions Displaying Data2.3 Identify the variable type: a) quantitative b) categorical c) categorical d) quantitative 2.6 Discrete or continuous?: a) continuous b) discrete c) continuous d) discrete 2.8 Number of children:a) The variable, number of chi
Penn State - STAT - 200
Solutions Gathering Data 4.5 School testing for drugs : Although this study found similar levels of drug use in schools that used drug testing and schools that did not, lurking variables might have affected the results. For example, it is possible that sc
Penn State - STAT - 200
Solutions - Probability Distributions 6.3 Boston Red Sox hitting: a) The probabilities give a legitimate probability distribution because each one is between 0 and 1 and the sum of all of them is 1. b) = 0P(0) + 1P(1) + 2P(2) + 3P(3) + 4P(4) = 0(0.718) +
Penn State - STAT - 200
Solutions - Sampling Distributions 7.6 Exit poll and n: a) The interval of values within the sample proportion will almost certainly fall within three standard errors of the mean: 0.53 to 0.59. b) Based on the interval calculated in (a), it would be unusu
Penn State - STAT - 200
Solutions - Hypothesis Testing9.4 Iowa GPA: H 0 : = 2.80Ha :2.80In the above hypotheses, H 0 : is the notation for the null hypothesis, H a : is the notation for the alternative hypothesis, and is the parameter, the mean GPA of the population, about w
Penn State - STAT - 200
Solutions - Categorical Variables11.3 FBI statistics: a) These distributions refer to those of x at given categories of y. RACE OF VICTIM RACE OF MURDERER Blacks WhitesBlacks Whites91% 9%17% 83%b) x and y are dependent because the probability of a mu
Penn State - STAT - 200
Confidence Intervals Proportion and One Mean1 The term sampling frame refers to the group that actually had a chance to get into the sample. Ideally, this is the same as the population of interest, but sometimes it isnt. In the following situation, descr
Penn State - PSYCH - 412
Growth Spurt: Muscle Mass and Body Fat Rapid acceleration in height and weight; significant boost in muscle and body fat By the end of puberty, the muscle to fat ratio is: Boys = 3:1 Girls = 5:4 Boys gain muscle at a faster rate than girls Girls gain fat
Penn State - PSYCH - 412
Changes in Cognition Logical Thinking Transductive Thinking: connects two particular events into a cause-effect relationship simply because they occurred close in time Inductive Thinking: we make inferences about the world based on a limited set of experi
Penn State - PSYCH - 412
Brain Development neuron: single cell unit of the central nervous system nerve: single cell unit of the peripheral nervous system dendrites: top of the neuron; extensions, branches; gather incoming information to pass it along to be processed soma (or cel
Penn State - PSYCH - 412
Social Redefinition a period when the individual is being redefined by their society, from that of a child towards that of an adult (increased privileges and responsibilities) social redefinition tends to be more pronounced in traditional societies compar
Penn State - PSYCH - 412
The Generation Gap occurs when older and younger people fail to understand one another due to their different experiences, opinions, habits and overall behaviorParent-Adolescent Conflict G. Stanley Hall (1904) believed in storm and stress Anna Freud (194
Penn State - PSYCH - 412
Adolescents and their Peers high school students spend twice as much time with their peers as their parents for boys, time spent with family is replaced with time spent alone for girls, time spent with family is replaced with time with friendsOrigins of
Penn State - PSYCH - 238
What do we know when we know a person? What we know about someone depends on how well we know them. However, you can never truly know everything about someone even ones own spouse or child. We often develop first impressions about individuals based on the
Penn State - PSYCH - 238
1. Say that you want to create a self-judgment questionnaire to measure extroversion. You know from reading the Lesson Commentary that research by Dr. Johnson identified seven kinds of statements in self-judgment personality questionnaires. Which of the s
Penn State - PSYCH - 238
1. Name a personality trait that you think would be more validly measured with I-data than Sdata and explain why.Validity is the extent to which a measurement actually reflects or measures what you think it does. Likability is one personality trait that
Penn State - PSYCH - 238
L ist four personality t raits that you think describe you well. Make sure that one t rait is a behavioral t rait, one, an emotional t rait, one, a cognitive t rait, and one, a social imp ression. Label what kind of t rait each of your personality t raits
Penn State - PSYCH - 238
A r ebellious person is someone who defies or resists established r ules and a uthority. Write an item for an S-data personality test of rebelliousness and d escribe examples of L-data and B-data-not to be collected by self-judgment-that should be predict
Penn State - PSYCH - 238
A fter reading about the research on the authorita r ian personality, r ight-w ing a uthorita r ianism, and Jost's and Block's research on the personality t raits of conservatives, do you agree w ith some critics that politically liberal psychologists a r
Penn State - PSYCH - 256
Data summaryType of selected items In original list Normal distractor (not in list) Special distractor (not in list) Percentage of reports 42.857143 0.0 16.666666Trial-by-trial dataEach trial has possible reports of: 7 words 'In list', 8 words 'Not in
Penn State - PSYCH - 256
Data summarySize of line without wings (pixels) 85.0 88.0 91.0 94.0 97.0 100.0 103.0 106.0 109.0 112.0 Proportion of line w/o wings bigger 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.4115.0 118.0 121.0 124.0 127.00.4 0.8 1.0 1.0 0.9Trial-by-trial dataThe M
Penn State - PSYCH - 256
Data summaryCondition Name and font same: Name and font different: RT (ms) 953.3333 1055.7333Trial-by-trial dataOn each trial, a color word (second column) was shown in a colored font (third column). You identified the color of the font as quickly as p
Penn State - PSYCH - 256
u1 . Which of the stages represent attention according to the information-processing model presented in Chapter 1 of the textbook? A) Filter and selection. B) Sensory store and filter. O C) Selection and short-term memory. D) Filter and pattern recogniti
Penn State - PSYCH - 256
(^1 . If you described a friend by saying that he has dark hair, blue eyes and freckles, which pattern recognition theory would you be using? O A) Structural theory S B) Geon theory C) Feature theory D D) Template theoryP oints Earned: 1,0<^ 2 . The in
Penn State - PSYCH - 256
(^1 . Which of the stages represent attention according to the information-processing model presented in Chapter 1 of the textbook? A) Filter and selection. B) Sensory store and filter. 5 C) Selection and short-term memory. D) Filter and pattern recognit
Penn State - PSYCH - 256
1.According to the attenuation model of attention, which of the following words is most likely to be recognized on an unattended channel? O A) Your name 9 B) Danger words, such as "fire" _) c ) Words that fit the context of what is recognized on the atte
Penn State - PSYCH - 256
1.The term mental effort is defined as: A) Investing attention in more than one task ' B) The amount of mental capacity required to perform a task 5 C) Selecting information when a stage of information processing becomes overloaded D) Limitations in the
Penn State - PSYCH - 256
1.The term automatic processing is used to describe: A) Learning that occurs with conscious intent B) Amount of activation required for conscious awareness of information C) Description of how quickly people can react to a target 0 D) Performance of ment
Penn State - PSYCH - 256
^1 . Which of the following is not an acquisition strategy? - A) Rehearsal. % B) Priming. C) Coding. D) Imaging.P oints Earned: 1,0^2 . When allocating study time, students tend to: O A) Rely only on STM when the test is the same day. B) Spend more ti
Penn State - PSYCH - 256
^1 . Which of the following is not an acquisition strategy? O A) Rehearsal. B) Priming. C) Coding. C l D) Imaging.P oints Earned: 1,0^2 . Memory for the context in which a word occurs is unimportant when people are tested by: A) Recognition tests. B)
Penn State - PSYCH - 256
^1 . Memory for the context in which a word occurs is unimportant when people are tested by: A) Recognition tests. B) Recall tests. @ C) Indirect memory tests. D) Direct memory tests.P oints Earned: 1,0^2 . Accurate eyewitness identification depends o
Penn State - ECON - 002
Points Awarded Points Missed Percentage9.00 0.00 100%1. The idea in economics that "there is no free lunch" means A) Businesses would go bankrupt if they offered free lunches. B) The thought of a free lunch is often better than the reality of consuming
Penn State - ECON - 002
Points Awarded Points Missed Percentage10.00 0.00 100%1. In a competitive market for corn, the law of demand indicates that, other things equal, as A) The demand for corn decreases, the price will increase. B) Income decreases, the quantity of corn dema
Penn State - ECON - 002
Points Awarded Points Missed Percentage10.00 0.00 100%1. In a competitive market for corn, the law of demand indicates that, other things equal, as A) The demand for corn decreases, the price will increase. B) Income decreases, the quantity of corn dema
Penn State - ECON - 002
P oints A warded Points M issed Percentage9.001.0090.0 %1.Official unemployment rates may underestimate the true rate of unemployment because the official rate A) includes those workers who only work part time. B) may include some individuals who are
Penn State - ECON - 002
P oints A warded Points M issed Percentage12.0 0 0.00 100 %1. T he largest component of GDP is: A) Government purchases B) Personal consumption expenditures. C) Gross private domestic investment. D) Net foreign factor income earned in the United States.