Example 140 The drug Depo-Provera is often used for patients who exhibit hypersexual behavior caused by traumatic brain injury (TBI). The results of a study conducted on 8 patients who exhibited such behavior are included below. Each patient had their testosterone levels taken before treatment with Depo and after treatment. At the 1% significance level, test the claim that the drug is effective at reducing testosterone levels in TBI patients.

Patient	1	2	3	4	5	6	7	8
Pretreatment	849	903	890	1092	362	900	1006	672
After Depo	96	41	31	124	46	53	113	174
Differences	753	862	859	968	316	847	893	498

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Example 140

Sample Exams