JOB AID
KNOWING WHAT STATISTICS TO USE
Even if you have a basic understanding of statistics, it can be difficult to know what statistical calculations to use in a given situation. Use this job aid below to remind yourself of what calculation to use; the final column shows you how each is performed.
| NEED | CALCULATIONS TO USE | HOW TO DO IT |
| You want to describe your data set's central tendency. | Mean | Add up the values, then divide by the number of items in the data set (n) |
| Median | Put the values in rank order and find the middle. If there is an even number of values, take the average of the two points that share the middle position. | |
| Mode | Count up how frequently each value in the data set occurred. The most frequent value is the mode. ... |
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