Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $39,000 and $56,800. Assume that a 95% confidence interval estimate of the population mean annual starting salary is desired. (Round your answers up to the nearest whole number.)
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 $400? Round your answer to next whole number.
$250?
890?
c. Would you recommend trying to obtain the S90 margin of error? Explain. Select your answer
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