Question: A random sample of 23 items is drawn from a population whose standard deviation is unknown. The sample mean is I = 820 and the

A random sample of 23 items is drawn from a population whose standard deviation is unknown. The sample mean is I = 820 and the sample standard deviation is s = 25. Use Appendix D to find the values of Student's t (a) Construct an interval estimate of // with 99% confidence. (Round your answers to 3 decimal places.) The 99% confidence interval is from (b) Construct an interval estimate of // with 99% confidence, assuming that s = 50. (Round your answers to 3 decimal places.) The 99% confidence interval is from

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