Contents	Introduction	Descriptive	Hypothesis	Tables	Appendix

Part II Describing Data

Central Tendency
Variation
Proportions

Part II presents techniques used to describe samples. For interval level data, measures of central tendency and variation are common descriptive statistics. Measures of central tendency describe a series of data with a single attribute. Measures of variation describe how widely the data elements vary. Standardized scores combine both central tendency and variation into a single descriptor that is comparable across different samples with the same or different units of measurement. For nominal/ordinal data, proportions are a common method used to describe frequencies as they compare to a total.