Kevin thinks that his sample of patients who have experienced therapy have fewer symptoms of depression (X) than the average person with depression () He conducts a z test and rejects the null hypothesis He states that this is proof that his patients get better after experiencing his therapy What i...

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Kevin thinks that his sample of patients who have experienced therapy have fewer symptoms of depression (X)

Question:

Kevin thinks that his sample of patients who have experienced therapy have fewer symptoms of depression (X) than the average person with depression (μ). He conducts a z-test and rejects the null hypothesis. He states that this is proof that his patients get better after experiencing his therapy. What is the flaw in Kevin’s logic?

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