In a study of communication, researchers used a language rating scale to compare two groups of participants. Participants in Group A were a volunteer sample of people from a self-help group for people with schizophrenia. Participants in Group B, the control group, were a volunteer sample of people who attended a community centre.
The researchers used an inferential statistical test to see if there was a significant difference in language rating between the two groups.
Explain why a Mann-Whitney test is an appropriate choice of statistical test in this situation and a Spearman’s test is not.
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