A random sample of 20 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯x¯ = 930 and the sample standard deviation is s = 5. 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 _______ to _______.   (b) Construct an interval estimate of μ with 98% confidence, assuming that s = 10. (Round your answers to 3 decimal places.) The 98% confidence interval is from _______ to _______.   (c) Construct an interval estimate of μ with 98% confidence, assuming that s = 20. (Round your answers to 3 decimal places.) The 98% confidence interval is from _______ to _______.

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