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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.
Taken together, the values for process center, spread, skewness and kurtosis can tell you a great deal about your process. 1  However, unless you have a solid statistics background, you will probably learn more from looking at the histogram itself than from looking at the statistics.