8. Award: 0 out of 1,00 point The proportion of public accountants who have chan

Question

8. Award: 0 out of 1,00 point 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. (UseZ 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? 2710 b. How many public accountants should be contacted if no previous estimates of the population proportion are available? 423 ® eBook &Resources;

Explanation / Answer

here std error of mean =std deviation/(n)1/2 =8700/(27)1/2 =1674.32

for (n-1=26) degree of freedom and 95% CI ; z =2.056

hence 95% confidence interval for the mean amount =sample mean -/+ t*std error =34958 and 41842

please reply.

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