Descriptive Statistics

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Presentation transcript:

Descriptive Statistics Overview

Mean

Median

Things to know …. Means are sensitive to outliers—use the median (outliers are extreme values) If the number of data points is odd, the median is the number in the middle. If the number of data points is even, the median is the average of the numbers nearest the middle When your data set is all categories, use the mode (mode is value occurring most often)

Spread

SPSS Steps Open SPSS data file Click on ANALYZE Click on DESCRIPTIVE Click on FREQUENCIES Select variables of interest (ALL) Click STATISTICS Select preferred measures of central tendency and spread Click CONTINUE Click OK

Frequency Output

Frequency Output