Introduction to Probability and Statistics
14th Edition
ISBN: 9781133103752
Author: Mendenhall, William
Publisher: Cengage Learning
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Chapter 8.4, Problem 8.16E
To determine
To find: The estimate of population
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9.2 Testing the Mean mu:
Problem 3
(1 point)
Test the claim that the population of sophomore college
students has a mean grade point average greater than 2.2.
Sample statistics include n = 71, x = 2.44, and s = 0.9.
Use a significance level of a = 0.01.
The test statistic is
The P-Value is between :
The final conclusion is
< P-value <
A. There is sufficient evidence to support the claim that
the mean grade point average is greater than 2.2.
○ B. There is not sufficient evidence to support the claim
that the mean grade point average is greater than 2.2.
Note: You can earn partial credit on this problem.
Note: You are in the Reduced Scoring Period. All work counts for
50% of the original.
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Chapter 8 Solutions
Introduction to Probability and Statistics
Ch. 8.4 - Prob. 8.3ECh. 8.4 - Prob. 8.4ECh. 8.4 - Prob. 8.5ECh. 8.4 - Prob. 8.6ECh. 8.4 - Prob. 8.7ECh. 8.4 - Prob. 8.8ECh. 8.4 - Prob. 8.9ECh. 8.4 - Prob. 8.10ECh. 8.4 - Prob. 8.11ECh. 8.4 - Prob. 8.12E
Ch. 8.4 - Prob. 8.13ECh. 8.4 - Prob. 8.14ECh. 8.4 - Prob. 8.15ECh. 8.4 - Prob. 8.16ECh. 8.4 - Prob. 8.18ECh. 8.4 - Prob. 8.19ECh. 8.4 - Hotel Costs Even within a particular chain of...Ch. 8.4 - Prob. 8.21ECh. 8.5 - Find and interpret a 95% confidence interval for a...Ch. 8.5 - Find a 90% confidence interval for a population...Ch. 8.5 - Prob. 8.26ECh. 8.5 - Prob. 8.27ECh. 8.5 - Prob. 8.28ECh. 8.5 - Prob. 8.29ECh. 8.5 - Compare the confidence intervals in Exercise 8.29....Ch. 8.5 - Prob. 8.31ECh. 8.5 - Prob. 8.32ECh. 8.5 - Prob. 8.33ECh. 8.5 - Prob. 8.34ECh. 8.5 - Prob. 8.35ECh. 8.5 - Prob. 8.36ECh. 8.5 - Prob. 8.38ECh. 8.5 - What’s Normal? What is normal, when it comes to...Ch. 8.5 - Prob. 8.40ECh. 8.6 - Independent random samples were selected from...Ch. 8.6 - Prob. 8.42ECh. 8.6 - Prob. 8.43ECh. 8.6 - Prob. 8.44ECh. 8.6 - Prob. 8.45ECh. 8.6 - Prob. 8.46ECh. 8.6 - Prob. 8.47ECh. 8.6 - Prob. 8.48ECh. 8.6 - Prob. 8.49ECh. 8.6 - Prob. 8.50ECh. 8.6 - Hotel Costs Refer to Exercise 8.20. The means and...Ch. 8.6 - Noise and Stress To compare the effect of stress...Ch. 8.6 - Prob. 8.53ECh. 8.7 - Prob. 8.54ECh. 8.7 - Prob. 8.55ECh. 8.7 - Prob. 8.56ECh. 8.7 - Prob. 8.58ECh. 8.7 - Prob. 8.61ECh. 8.7 - Prob. 8.64ECh. 8.7 - Prob. 8.65ECh. 8.7 - Prob. 8.66ECh. 8.9 - Prob. 8.67ECh. 8.9 - Prob. 8.68ECh. 8.9 - Prob. 8.69ECh. 8.9 - Prob. 8.70ECh. 8.9 - Prob. 8.71ECh. 8.9 - Prob. 8.72ECh. 8.9 - Prob. 8.73ECh. 8.9 - Prob. 8.75ECh. 8.9 - Prob. 8.77ECh. 8.9 - Prob. 8.78ECh. 8.9 - Prob. 8.80ECh. 8.9 - Prob. 8.81ECh. 8.9 - Prob. 8.83ECh. 8 - Prob. 8.86SECh. 8 - Prob. 8.87SECh. 8 - Prob. 8.88SECh. 8 - Prob. 8.89SECh. 8 - Prob. 8.90SECh. 8 - Prob. 8.91SECh. 8 - Prob. 8.92SECh. 8 - Prob. 8.93SECh. 8 - Prob. 8.94SECh. 8 - Prob. 8.95SECh. 8 - Prob. 8.96SECh. 8 - Prob. 8.98SECh. 8 - Prob. 8.99SECh. 8 - Prob. 8.100SECh. 8 - Prob. 8.101SECh. 8 - Prob. 8.103SECh. 8 - Prob. 8.107SECh. 8 - Prob. 8.108SECh. 8 - Prob. 8.109SECh. 8 - Prob. 8.110SECh. 8 - Prob. 8.111SECh. 8 - Prob. 8.112SECh. 8 - Prob. 8.113SECh. 8 - Prob. 8.114SECh. 8 - Prob. 8.115SECh. 8 - Prob. 8.116SECh. 8 - Prob. 8.117SE
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- There are four white, fourteen blue and five green marbles in a bag. A marble is selected from the bag without looking. Find the odds of the following: The odds against selecting a green marble. The odds in favour of not selecting a green marble The odds in favor of the marble selected being either a white or a blue marble. What is true about the above odds? Explainarrow_forwardPlease show as much work as possible to clearly show the steps you used to find each solution. If you plan to use a calculator, please be sure to clearly indicate your strategy. 1. The probability of a soccer game in a particular league going into overtime is 0.125. Find the following: a. The odds in favour of a game going into overtime. b. The odds in favour of a game not going into overtime. c. If the teams in the league play 100 games in a season, about how many games would you expect to go into overtime?arrow_forwardexplain the importance of the Hypothesis test in a business setting, and give an example of a situation where it is helpful in business decision making.arrow_forward
- A college wants to estimate what students typically spend on textbooks. A report fromthe college bookstore observes that textbooks range in price from $22 to $186. Toobtain a 95% confidence level for a confidence interval estimate to plus or minus $10,how many students should the college survey? (We may estimate the populationstandard deviation as (range) ÷ 4.)arrow_forwardIn a study of how students give directions, forty volunteers were given the task ofexplaining to another person how to reach a destination. Researchers measured thefollowing five aspects of the subjects’ direction-giving behavior:• whether a map was available or if directions were given from memory without a map,• the gender of the direction-giver,• the distances given as part of the directions,• the number of times directions such as “north” or “left” were used,• the frequency of errors in directions. Identify each of the variables in this study, and whether each is quantitative orqualitative. For each quantitative variable, state whether it is discrete or continuous. Was this an observational study or an experimental study? Explain your answer.arrow_forwardexplain the difference between the confident interval and the confident level. provide an example to show how to correctly interpret a confidence interval.arrow_forward
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