# do I just assume that the data is normally distributed when deciding what statistic test to use?

This is from the exercise

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Good question, For this exercise then yes we can assume normality. It makes sense as most peoples difference would be around the middle of the range with a few extreme values. There is a statistical test that you can use to test whether a collection of values could be assumed to be normal. Look at the Shapiro-Wilk test for further infomation