Confidence Interval Estimates of a Population Mean
8. A random sample of 102 full-grown lobsters had a mean weight of 16 ounces and a
standard deviation of 3.4 ounces. Construct a 98 percent confidence interval for the population mean .
Find a confidence
Hypothesis Testing About a Mean
7d. An experiment examined the impact of THC (the active ingredient in marijuana) on
various physiological and psychological variables. The study recruited a sample of 50
young adults who were habitual marijuana smokers. Su
Hypothesis Testing for Matched Pairs
6.The effectiveness of a headache medicine is tested by measuring the intensity of a
headache in patients before and after drug treatment. The data consist of before and after
intensities for each patient.
Confidence Interval about a Population Proportion
7. Of 94 adults selected randomly from one town, 67 have health insurance.
Find a 90% confidence interval for the true proportion of all adults in the town who
have health insurance.
Use Interval Notation
Find the Sample Size Necessary to Estimate a Parameter
4e. An IQ test is designed so that the mean is 100 and the standard deviation is 24 for the
population of normal adults. Find the sample size necessary to estimate the mean IQ
score of statistics stud
Hypothesis Testing and Estimates about 2 Means
5. Researchers measured the amount of plasma carotenoids (in microgram per milliliter)
of male and female zebra finches. Here are the summary statistics from the study.
Do male and female zebra finches differ
Hypothesis Testing and Estimates About 2 Population Proportions
3d. A study was conducted to determine the proportion of people who dream in black
and white instead of color. Among 312 people over the age of 55, 79 dream in black and
white, and among 288
9. Of 126 adults selected randomly from one town, 33 of them
FInd the best point estimate for the true percentage of all adults
in the town that smoke.
Express your answer as a percent rounded to the nearest hundredths.
The Central Limit Theorem
6. For women aged 18-24, systolic blood pressures (in mm Hg) are normally distributed
with a mean of 114.8 and a standard deviation of 13.1. If 23 women aged 18-24 are randomly selected, find the probability that their mean systo
Hypothesis Testing II
4. To the nearest thousandth, find the 'p-value' in a left-tail hypothesis test given the Test
Statistics z = -2.57
5. To the nearest thousandth, find the "p-value" in a right-tail hypothesis test given the
Test Statistics z =
Hypothesis Testing About a Proportion (Per Cent)
5. An inspector inspects a shipment of medications to determine the efficacy in terms of
the proportion p in the shipment that failed to retain full potency after 60 days of production. To do so, she select
Hypothesis Testing I
7. State the null and alternative hypotheses for the following claim.
The average age of community college statistics students is at least 29.5 years old.
H0: 29.5 and H1: < 29.5
13. State the null and alternative hypotheses for the c
Type I and Type II Errors
2a. Identify the type I error. Choose the correct answer below
Reject the null hypothesis that the percentage of households with Internet access is
equal to 60% when that percentage is actually equal to 60%.
1a. Which of the foll
Properties of a Normal Distribution
8. The lengths of one-year-old baby girls can be described using a Normal distribution
with a mean of 29 inches and a standard deviation of 1.2 inches.
Using the Empirical '68-95-99.7' Rule, what percent of one-year-old
Working with the Normal Distribution
8. Find the area of the shaded region. The graph to the right depicts IQ scores of adults,
and those scores are normally distributed with a mean of 100 and a standard deviation of
Round answer to four decimal place
Multiplication Rule Homework
3. 25% of students in a Statistics class said that they liked Statistics more
than Algebra. If 3 of these students are randomly selected, what is the probability that all 3 students said that they liked Statistics more than Al
Homework-The Addition Rule Homework
1. A card is drawn from a standard deck of playing cards. What is the probability that the card is
either a King or an Ace? (Express your answer as a percent to the nearest tenth. Please include
the % symbol)
Basic Probability Distribution Homework
8. Determine whether the following value is a continuous random variable, discrete random variable, or not a random variable.
Is the number of statistics students now doing their homework a discrete random variable,
Homework-Simple Probability Homework
5. Express the number .0057 as a percent rounded to the hundredth place. (Please include
the % symbol.)
6. Express the number .0957 as a percent rounded to the hundredth place. (Please include
the % symbol.)
Probability Distributions Homework
4. Assume that a researcher randomly selects 14 newborn babies and counts the number
of girls selected, x. The probabilities corresponding to the 14 possible values of x are
summarized in the given table. Answer the ques
The Binomial Distribution Homework
3. Determine whether the given procedure results in a binomial distribution. If not, state
the reason why.
Rolling a single die 26 times, keeping track of the 'fives' rolled.
Procedure results in a binomial distribution.
The 5-Number Summary Homework
5. Calculate the 5 - number summary for the following Data Set.
24 45 62 78 90 130 34 67 130 10
10 34 64.5 90 130
6. Calculate the 5 - number summary for the following Data Set.
24 45 62 78 90 130 64 67 130 10
10 45 65.5 90 1
#Function converts lat and lon inputs into radians
#and calculates the central angle
#Then multiplies it by the radius of the earth to
#result with e