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ASK THE PROFESSOR FORUM 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

### Example 126

Example 126: In 1980, the average time to complete a “four-year” degree was 4.9 years.  In 2006, a study of 31 randomly selected students had an average completion time for their four-year degree of 5.3 years with a population standard deviation of 1 year.  Use the p-value method to test the claim that the mean time to complete a four-year degree is now more than 4.9 years.

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