Common Statistical Mistakes

12/6/99


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Table of Contents

Common Statistical Mistakes

Mistake #1

Example: Wrong Decision Due to Error

Example: Wrong Decision Due to Error

Mistake #2

Example: Wrong Decision Due to Wrong Analysis

Example: Wrong Decision Due to Wrong Analysis

Example: Wrong Decision Due to Wrong Analysis

Mistake #3

Example: Low Power

Example: Low Power

Mistake #4

Example: A Significant, but Potentially Meaningless Difference

Incidentally….

Removing Outliers …

Mistake #5

Example: Results Obtained from Fishing

Mistake #6

Example: Misleading Headlines

Mistake #7

Example: Unrepresentative sample

Mistake #8

Author: Laura J. Simon

Email: lsimon@stat.psu.edu

Home Page: http://www.stat.psu.edu/~lsimon/stat250/fa99/admin/

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