Twenty subscribers were surveyed it found that the annual, Ask an Expert

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Twenty subscribers were surveyed, it found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979.00. The standard deviation of the sample was $1000.00.

a. based on this sample information, develop a 90% confidence interval for the population mean yearly premium.

b. How large a sample is needed to find the population mean within $250 at 99% confidence?

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