Question

Question 2 2 pts You plan to conduct a clinical trial to test the effectiveness of nicotine patch therapy in helping smokers to stop smoking. How many smokers must be included to ensure a 98% confidence level that the estimate is in error by no more than three percentage points? A. First, assume that nothing is known about the effectiveness of nicotine patch therapy. Minimum sample size needed: B. Next, assume that a prior clinical trial suggests that nicotine patch therapy has a success rate of about 66%. Also, the researchers change their plans and decide on a 96% confidence level with a margin of error no more than two and a half percentage points. Minimum sample size needed: C. Does the additional clinical information and research changes from part (B) have much of an effect on the sample size that is required? i. It increases the sample size needed from (A) to (B) by less than 500 smokers. ii. It decreases the sample size needed from (A) to (B) by over 500 smokers. iii. It makes the change in sample sizes of over 1,000 smokers, iv. It has almost no meaningful effect on the sample sizes required with the sizes almost equal.

Answer 1

solution:- 2) AJ ME = 2012 p 11-P) 0.58o.5 0.032 2.326 x n. 3 ) na 1502.9 1503 so sample size = B) ME = 2012 pll-b) = ) 0.6680.34 0.025 22.054 X n = 1514.8 SD sample size = 1515 9) iv It has almost no mearning tal effect on the sample sizes required with the sizes almost equal.