10. 11. 00000.0 Annual starting salaries for college graduates with degrees in business administration are generally expected to be between $30,000 and $50,000. 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? 0' = b. How large a sample should be taken if the desired margin of error is $300? Round your answers to next whole number. $230? $90? c. Would you recommend trying to obtain the $90 margin of error? Explain. - Select your answer - v