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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.
When you compare two or more data sets, focus on four features: 1  Center. 2  Graphically, the center of a distribution is the point where about half of the observations are on either side. 3  Spread.4  The spread of a distribution refers to the variability of the data. 5  If the observations cover a wide range, the spread is larger.hen dotplots are used to compare data sets, they are positioned one above the other, using the same scale of measurement, as shown on the right. The dotplot on the right shows pet ownership in homes on two city blocks.