3. A clinical trial examined the effectiveness of aspirin in the treatment of cerebral ischemia(stroke). Patients...

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3. A clinical trial examined the effectiveness of aspirin in thetreatment of cerebral ischemia(stroke). Patients were randomizedinto treatment and control groups. The study wasdouble-blind. Aftersix months of treatment, the attending physicians evaluatedeachpatient’s progress as either favorable or unfavorable. Of the78 patients in the aspiringroup, 63 had favorable outcomes; 43 ofthe 77 control patients had favorable outcomes.(A) The physiciansconducting the study had concluded from previous researchtheaspirin was likely to increase the chance of a favorableoutcome. Carry out a significancetest to confirm this conclusion.State the hypotheses, find aP-value, and write a summaryof yourresults.(B) Estimate the difference between the favorableproportions in the treatment andcontrol groups. Use 95%confidence.

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Part A Here we have to use z test for difference between population proportions Null hypothesis H0 The aspirin was not likely to increase the chance of favourable outcomes Alternative hypothesis Ha The aspirin was likely to increase the chance of favourable outcomes H0 p1 p2 versus Ha p p2 See Answer

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