A random sample of 21 items is drawn from a population whose standard deviation is unknown. The sample mean is x¯x¯ = 910 and the sample standard deviation is s = 20. Use Appendix D to find the values of Student’s t. (a) Construct an interval estimate of μ with 99% confidence. the 99 confidence is from _____ to _______ b) Construct an interval estimate of μ with 99% confidence, assuming that s = 40.  the 99 confidence is from _____ to _______ (c) Construct an interval estimate of μ with 99% confidence, assuming that s = 80. the 99 confidence is from _____ to _______

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