Intro Stats, Books a la Carte Edition (5th Edition)
5th Edition
ISBN: 9780134210285
Author: Richard D. De Veaux, Paul Velleman, David E. Bock
Publisher: PEARSON
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Chapter 18, Problem 19E
a.
To determine
Explain the summary that helps to decide whether the online company offers cheaper insurance.
b.
To determine
Explain the reason why the standard deviation of the price difference is smaller than the standard deviation of the price quoted by the local and online company.
c.
To determine
Check whether the assumptions for the hypothesis test have been satisfied.
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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 18 Solutions
Intro Stats, Books a la Carte Edition (5th Edition)
Ch. 18.4 - Think about each of the situations described...Ch. 18.4 - Prob. 2JCCh. 18.4 - Are parents equally strict with boys and girls? In...Ch. 18.4 - Prob. 4JCCh. 18.4 - Prob. 5JCCh. 18 - SECTION 18.1 1. Which method? Which of the...Ch. 18 - Prob. 2ECh. 18 - SECTION 18.2 3. Cars and trucks We have data on...Ch. 18 - Vehicle weights II The calibration test for a new...Ch. 18 - Prob. 5E
Ch. 18 - Prob. 6ECh. 18 - Blocking cars and trucks Thinking about the data...Ch. 18 - Prob. 8ECh. 18 - Prob. 9ECh. 18 - Prob. 10ECh. 18 - Prob. 11ECh. 18 - Freshman 15? Many people believe that students...Ch. 18 - Prob. 13ECh. 18 - Prob. 14ECh. 18 - Prob. 15ECh. 18 - Friday the 13th, accidents The researchers in...Ch. 18 - Prob. 17ECh. 18 - Prob. 18ECh. 18 - Prob. 19ECh. 18 - Wind speed, part II In Exercise 18, we saw summary...Ch. 18 - Prob. 21ECh. 18 - Prob. 22ECh. 18 - Prob. 25ECh. 18 - Brain waves An experiment was performed to see...Ch. 18 - Prob. 27ECh. 18 - Prob. 28ECh. 18 - Prob. 29ECh. 18 - Prob. 30ECh. 18 - Stopping distance A tire manufacturer tested the...Ch. 18 - Stopping distance 60 For another test of the tires...Ch. 18 - Prob. 33ECh. 18 - Prob. 34ECh. 18 - Prob. 36ECh. 18 - Prob. 37ECh. 18 - Marathon start-up years 2016 When we considered...Ch. 18 - BST Many dairy cows now receive injections of BST,...Ch. 18 - BST II In the experiment about hormone injections...
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