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Confidence interval for the population mean

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Reference no: EM132847996

Part 1

In order to set rates, an insurance company is trying to estimate the number of sick days that full time welders in an oilfield welding company take per year. A previous study indicated that the standard deviation was 8.2 days. How large a sample must be selected if the company wants to be 90% confident that the true mean differs from the sample mean by no more than 2 days?

Part 2

A random sample of 16 healthy adults over the age of 45 showed a mean systolic blood pressure of 129 mm Hg and a standard deviation of 11 mm Hg. Construct a 98% confidence interval for the population mean of systolic blood pressure. Assume that systolic blood pressure is approximately normally distributed.

Reference no: EM132847996

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