[See] Families USA , a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It found that the annual
Question: Families USA , a monthly magazine that discusses issues related to health and health costs, surveyed 20 of its subscribers. It found that the annual health insurance premiums for a family with coverage through an employer averaged $10,979. The standard deviation of the sample was $1,000.
- Based on this sample information, develop a 90 percent confidence interval for the population mean yearly premium.
- How large a sample is needed to find the population mean within $250 at 99 percent confidence?
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