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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

A consumer group claims that the Doritos snack pack size has an average weight below 1.75 ounces which is the weight labeled on the bags.  A random sample of 49 bags had an average weight of 1.71 ounces and a standard deviation of 0.13 ounces.  At the 5% significance level, test the consumer group’s claim.  Give the practical interpretation of the outcome of the test.

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