Question: A sample is to be taken to develop an approximate 95% confidence interval estimate of the population mean. The population consists of 450 elements, and

A sample is to be taken to develop an approximate 95% confidence interval estimate of the population mean. The population consists of 450 elements, and a pilot study resulted in s = 70. How large must the sample be if we want to develop an approximate 95% confidence interval with a width of 30?

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