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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 177

Example 177: Statistics can be used to detect fraud.  There is a pattern that turns up when observing the leading digit in real data (as opposed to fake data like you might find in falsified financial records).  That pattern is expressed by Benford’s law.  The table below lists the percentages for leading digits from Benford’s Law that we would expected to observe.  It also list the number of leading digits actually observed on a batch of 784 checks that are believed to be fraudulent.

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