Annual starting salaries for college graduates with degrees in business administration are generally expected be between $10,000 and $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. $250? $80? c. Would you recommend trying to obtain the $80 margin of error? Explain. - Select your