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Descriptive statistics give us a quick way to summarize a large set of data gathered from a psychological study.

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Raw scores are often arranged into a frequency distribution, either a frequency histogram or frequency polygon.

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The central tendency of a distribution can be described by the mode (the most common score)

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the median (the middle score), or the mean (the arithmetic average of the scores).

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The variability of a distribution can be expressed as the range (the difference between the greatest and least score)

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or the standard deviation (a measure of the average difference between the scores and the mean).

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Overall, these measures allow us to describe our data in a useful and meaningful way.