8. value: 1.00 points The proportion of public accountants who have changed comp

Question

8. value: 1.00 points The proportion of public accountants who have changed companies within the last three years is to be estimated within 4%. The 90% level of confidence is to be used. A study conducted several years ago revealed that the percent of public accountants changing companies within three years was 20. (Use Z Distribution Table.) (Round the z-values to 2 decimal places. Round up your answers to the next whole number.) a. To update this study, the files of how many public accountants should be studied? 300 b. How many public accountants should be contacted if no previous estimates of the population proportion are available?423 References eBook & Resources

Explanation / Answer

8)a )here margin of error E =0.04

for 90% CI ; z=1.645

and p=0.20

hence sample size n=p(1-p)*(Z/E)2 =271

b) for no estimate p=0.5

hence sample size n=p(1-p)*(Z/E)2 =423

7)

here std deviation =48

margin of error E =10

for 99% Ci ;z =2.5758

hence sample size n=(z*std deviation/E)2 =~153

please revert for any clarification required.

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