A random sample of 24 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯x¯ = 870 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 μ with 98% confidence. (Round your answers to 3 decimal places.)    The 98% confidence interval is from blank to blank?   (b) Construct an interval estimate of μ with 98% confidence, assuming that s = 50. (Round your answers to 3 decimal places.)    The 98% confidence interval is from  blank to blank?   (c) Construct an interval estimate of μ with 98% confidence, assuming that s = 100. (Round your answers to 3 decimal places.)    The 98% confidence interval is from blank to blank?

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