Chapter 4: Central Tendency and Variability



Central Tendency

1. Arithmetic Mean

A. Definition













B. Properties













C. Overall mean












2. Median

A. Definition













B. Computation













C. Properties














3. Mode



A. Definition













B. Computation













C. Properties













4. When to use what?










Variability



1. Range













2. Standard Deviation























A. Deviation equation

















a. Population













b. Sample













B. Raw score equation



a. Population







b. sample



C. Properties







3. Variance





Statistics