5. value: 1.00 points Suppose the U.S. president wants an estimate of the propor

Question

5. value: 1.00 points Suppose the U.S. president wants an estimate of the proportion of the population who support his current policy toward revisions in the health care system. The president wants the estimate to be within 0.03 of the true proportion. Assume a 90% level of confidence. The president's political advisors estimated the proportion supporting the current policy to be 0.40. (Use z Distribution Table.) How large of a sample is required? (Round the z-values to 2 decimal places. Round up your answer to the next whole number.) Sample 170 b. How large of a sample would be necessary if no estimate were available for the proportion supporting current policy? (Round the z-values to 2 decimal places. Round up your answer to the next whole number.) 752

Explanation / Answer

5) a) here p=0.40

margin of error E =0.03

for 90% CI ; z =1.645

tehrefore sample size n=p(!-p)*(Z/E)2 =~722

b)for no estimnate ; p=0.5

tehrefore sample size n=p(!-p)*(Z/E)2 =~752

4)

std deviation =3

margin of error =0.5 (in hours)

for 99% CI ; z=2.5758

hence sample size n=(z*std deviation/E)2 =~239

please revert for any clarificcaiton required

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