A-

Statistics

by Tracy L. Caldwell

**What Does Statistics Have to Do with Psychology?****Descriptive Statistics: Summarizing Data**Tabular Summaries: Frequency Distributions

Pictures of Data: Histograms and Polygons

Central Tendency: Mean, Median, and Mode

Shapes of Distributions: Normal, Skewed, and Symmetrical

Variability: Range and Standard Deviation

Using the Mean and Standard Deviation to Make Comparisons:

*z*-scoresCorrelations

**Inferential Statistics**Were the Observed Differences Due to Chance?

How Large Are the Observed Differences?