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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

Example 171.5

Example 171.5: A manager is worried about hiring older workers because he fears that they may be more likely to call out sick.  He decides to look at the attendance records for sample of employees from the previous year.  The data is given below.  Find a 95% confidence interval for the average number of sick days used by a 53 year old employee. 

Employee Age

18

28

38

48

58

Sick Days Last Year

15

12

9

5

2

S = 0.31623

 

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