A random sample of 23 items is drawn from a population whose standard deviation is unknown. The sample mean is  x¯  = 840 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 μ with 98% confidence.        The 98% confidence Intraval is from ______ to ______ (b) Construct an interval estimate of μ with 98% confidence, assuming that s = 30.       The 98% confidence Intraval is from ______ to ______ (c) Construct an interval estimate of μ with 98% confidence, assuming that s = 60       The 98% confidence Intraval is from ______ to ______

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