Aspirin prevents blood from clotting and helps prevent strokes. The Second Europ

Question

Aspirin prevents blood from clotting and helps prevent strokes. The Second European Stroke Prevention Study asked whether adding another anticlotting drug named dipyridamole would be more effective for patients who had already had a stroke. Here are the data on strokes during the two years of the study: Is there a significant difference in the proportion of strokes in the two groups? Test at alpha = .01. (a). State the null and the alternative hypothesis where p_1 denotes the proportion of patients in the aspirin group who suffered a stroke and p_2 denotes the proportion of patients in the aspirin + dipyridamole group who suffered a stroke. H_0: p_1 = p_2 H_0: p_1 = p_2 H_0: p_1 = p_2 H_1: p_1 p_2 H_1: p_1 notequalto p_2 (b). p_1 = 0.3930 (c). p_2 = 0.6667 (d). The pooled estimate of p under H_0 is: (Enter your answer as an equation) (e). The test statistic is: (Enter your answer as an equation using the numbers in parts (b) - (d) rounded to four deci

Explanation / Answer

b)here p1hat=90/200 =0.45

c)and p2hat=220/400 =0.55

d)ppled estimate phat =(x1+x2)/(n1+n2)=(90+220)/(200+400)=0.5167

e)test stat =(p1-p2)/(phat(1-phat(1/n1+1/n2))1/2 =-2.3107

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.