What about cases where we have two groups and we want to see if the two groups differ but the data is **not** normally distributed? In that case we can use one of two non-parametric tests. The first is called the Mann-Whitney U Test and test to see whether two groups are different when each group is made up of different people.

**Note:** If you are using version 18 of SPSS (also known as PASW 18) there are now two ways of conducting non-parametric tests. To follow the instructions shown in the video follow the same menu selection of Analyse -> Non-parametric Tests and then goto Legacy Dialogs. This will bring up the same menu that you see in the videp.

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