Question: please help A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is = 850 and

please help

A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is = 850 and the sample standard deviation is s = 15. Use Appendix D to find the values of Student's t. (a) Construct an interval estimate of / with 95% confidence. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (b) Construct an interval estimate of // with 95% confidence, assuming that s = 30. (Round your answers to 3 decimal places.) The 95% confidence interval is from to (c) Construct an interval estimate of // with 95% confidence, assuming that s = 60. (Round your answers to 3 decimal places.) The 95% confidence interval is from to

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