## [answered] A job placement officer in a state university wants to dete

A job placement officer in a state university wants to determine the average starting salary of fresh college graduates. A confidence interval with a con?dence coefficient 1? a = 0.95 will be sufficient. The Width of the confidence interval should be no more than \$250. For sample size planning purpose, he assumes the population standard deviation of the starting salary is a = \$1200 . You are required to estimate a sample size n before a random sample is actually selected. (10)
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