Question

please help me i am having issurws with calculating the ridk differance and p1 -p2

nverea questions are on the back of the textbook. Questions 1-4 [Gerstman Exercise 17.3(a)(b)- Modified Version] Cytomegalovirus and coronary restenosis. Each year, cardiologists surgically repair thousands of clogged coronary arteries only to have many of these arteries narrow again (restenose) soon after surgery. A study sponsored by the NIH was conducted to help determine whether infection with a common type of virus, cytomegalovirus (CMV), contributed to coronary restenosis. Forty-nine of the subjects showed serological evidence of CMV infection, while 26 showed no such evidence. In the CMV+ group, 21 individuals restenosed within 6 months of atherectomy. In the CMV-group, 2 individuals restenosed. Question 1. Calculate the risk difference of restenosis associated with seropositivity Hint: Difference between risk in the CMV+ group and risk in the CMV- group.] A. 0.4286 B. 0.0769 C. 0.3517 Question 2. Calculate a standard error (SE) of the risk difference. A. 0.0907 B. 0.4314 C. 0.1071 Question 3. Calculate a 95% confidence interval for p1-p2 by the plus-four method. A. (0.2336, 0.4150) B. (0.1465, 0.5021) C. (0.1739, 0.5295) Question 4. What is an appropriate interpretation of this confidence interval that a layperson can understand. we are 95% confidence that CMV increases the risk of restenosis by between 23.36% A. B. We are 95% confidence that CMV increases the risk of restenosis by between 14.7% and C. we are 5% confidence that CMV increases the risk of restenosis by between 14.7% and D. and 41.50%. 50.2%. 50.2%. we are 95% confidence that CMV increases the risk of restenosis by between 53.0%.

Answer 1

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