Question: A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x-bar = 850 and the

A random sample of 25 items is drawn from a population whose standard deviation is unknown. The sample mean is x-bar = 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 percent confidence.
b. Repeat part a assuming that s = 30.
c. Repeat part a assuming that s = 60.
d. Describe how the confidence interval changes as s increases.

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