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* Description/Instructions. The familiar measures of center (mean, median, mode) and spread (range, standard deviation, variance, and interquartile range) will generally not be directly tested on the AP exam, because you can determine these so easily on your calculator. Description/Instructions. The familiar measures of center (mean, median, mode) and spread (range, standard deviation, variance, and interquartile range) will generally not be directly tested on the AP exam, because you can determine these so easily on your calculator.
DESCRIPTIVE MEASURES-Numbers that are used to describe data sets are called descriptive measures. MEASURES OF CENTER-Descriptive measures that indicate where the center or most typical value of a data set lies are called MEASURES OF CENTRAL TENDENCY or more simply, MEASURES OF CENTER. Measures of center are often referred to as AVERAGES.