Groups of schizophrenics and non-schizophrenics are compared based on the total

Question

Groups of schizophrenics and non-schizophrenics are compared based on the total number of trials, to a maximum of thirty, before the strength of each individual's startle reaction to loud noises diminishes below some predetermined value. Each group is relatively small and, furthermore, an inspection of the obtained scores (total number of trials before the startle reaction drops below some value) reveals a serious violation of normality. Now the appropriate statistical test is a

Mann-Whitney U.

Wilcoxon T.

Kruskal-Wallis H.

none of the above

Explanation / Answer

It is given that there are two group. And the sample size in each group is small and it is also given that the scores are not normally distributed. Hence, the appropriate test to test the difference between two groups will be Mann Whitney U

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