Psychology Inferential Tests Question

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pink.lemonade
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Hi! I wondered if anyone could help me. When doing this sheet in class i decided that the Mann-Whitney U Test would be an appropriate test to use. However, my teacher says its Wilcoxon Signed Ranks. Can someone explain why? I thought the design was unrelated/independent groups as you are either in the treatment group OR the non-treatment (hence i chose mann-whitney).

THE QUESTION:

A psychologist was interested in testing a new treatment for people with eating disorders. She put up adverts in several London clinics to recruit participants. Thirty people came forward and were all given a structured interview by a trained therapist. The therapist then calculated a excellent, healthy functioning and zero indicates failure to function adequately. The psychologist then randomly allocated half the participants to a treatment group and half to a no treatment group. After eight weeks, each participant was reassessed using a structured interview conducted by the same trained therapist, and given a new numerical score.
The trained therapist did not know which participants had been in either group. For each participant, the psychologist calculate an improvement score by subtracting the score at the start from the score after 8 weeks. The greater the number, the better the improvement.

'(b) Identify an appropriate statistical test for analysing the participants' scores. Explain why it would be a suitable test to use in this study'
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TSR Jessica
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Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.
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