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Course Documents

Chapter 1 - Intro

Chapter 2 - Methods for Describing Sets of Data

Chapter 3 - Probability

Chapter 4 - Discrete Random Variables

Chapter 5 - Normal Random Variables

Chapter 6 - Sampling Distributions

Chapter 7 - Confidence Intervals

Chapter 8 - Tests of Hypothesis: One Sample

Chapter 9 - Confidence Intervals and Hypothesis Tests: Two Samples

Sample Exam I: Chapters 1 & 2

Sample Exam II: Chapters 3 & 4

Sample Exam III: Chapters 5 & 6

Sample Exam IV: Chapters 7 & 8

Problem 1

9.11 Hypothesis Test to Compare Two Population Variances: Independent Sampling

Is there a difference between the variances of the number of weeks on the best seller lists for nonfiction and fiction books?  Fifteen New York Times bestselling fiction books had a standard deviation of 6.17 weeks on the list.   Sixteen New York Times bestselling nonfiction books had a standard deviation of 13.12 weeks.  At the 10% significance level, can we conclude there is a difference in the variances?

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