(Answered) Part a the mean of the sample was calculated as 500 the

Economics

Part a) The mean of the sample was calculated as 500. The sample of 25 observations was randomly drawn from a population whose standard deviation is 15. Estimate the population means with 99% confidence.

Part b) A random sample of 5 observations was drawn from a normal population. The sample mean and standard deviation are X =175 and s=30. Estimate the population mean with 90% confidence.

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