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The sample size is 288 and by Shapiro- Wilk test the data is not normally distributed.

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marked as duplicate by kjetil b halvorsen, mdewey, Silverfish, gung Nov 5 '18 at 13:46

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    $\begingroup$ What was the p-value for the test? $\endgroup$ – Michael Chernick Apr 20 '18 at 22:26
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    $\begingroup$ What is the purpose of the test and what is your criterion for significance? $\endgroup$ – whuber Apr 21 '18 at 13:50