Annual starting salaries for college graduates with degrees in business administration are generally expected to be between 30,000and 40,000. Assume that a 95% confidence interval estimate of the...

Annual starting salaries for college graduates with degrees in business administration are generally expected to be between 30,000and 40,000. Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired.

a. What is the planning value for the population standard deviation?

b. How large a sample should be taken if the desired margin of error is $500? Round your answers to next whole number.

$210 ?

$100?

c. Would you recommend trying to obtain $100the margin of error? Explain. - Select your answer -