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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 4

9.9 Inference Procedures to Compare Two Population Proportions: Independent Sampling

The Journal of Sport Behavior studied a variety of exercise workouts. One group of 38 people varied their exercise routine in workouts while a second group of 38 had no set schedule or regulations for their workouts. By the end of the study 14 people dropped out of the first exercise group and 23 had dropped out of the second group.
a. Find a 90 confidence interval for the difference between the dropout rates of the two groups of exercisers.
b. Conduct an appropriate test of hypothesis for the difference between the two groups, using the p-value, at α = .10

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