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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 2

9.1 Z-Interval to Compare Two Population Means: Independent Samples

Is there a difference between the quantitative problem solving skills of physical science majors (geology/physics/chemistry/…) and business majors?  GRE quantitative test scores for both groups are summarized below.  Find a 95% confidence interval for the true mean difference between the scores of physical science majors and business majors.  Is there a significant difference?  If so who does better?

physical science majors        business majors
n = 38                                    n = 42
sample mean = 692              sample mean = 594
s = 149                                 s = 151

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