Citation: Kiernan, Nancy Ellen (2008). TITLE: Tipsheet #86, University Park, PA: Penn State Cooperative Extension. This document is part of a series of Tipsheets that contain practical evaluation illustrations based on current research and developed by Nancy Ellen Kiernan at Penn State Cooperative Extension. This document focuses on the difference between a percent, mean, or some other calculation in reporting data. Copyright 2008 The Pennsylvania State University#Sampling #ExtensionEducationEvaluation #HowTo