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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

7.5 Small-Sample Confidence Intervals for a Population Mean

A sample of 28 healthy babies has an average birth weight of 6.83 lbs and a standard deviation of 1.53 lbs.  Construct a 95% confidence interval for the true average weight for healthy babies.  If another study revealed that babies exposed to cocaine prenatally had an average birth weight of 4.92 lbs, does it seem that cocaine might lead to lower than normal birth weights? 

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