Question: Refer to Exercise 61. Suppose the sample size here had been 20 instead of 49. Suppose, too, that the population standard deviation is unknown, but

Refer to Exercise 61. Suppose the sample size here had been 20 instead of 49. Suppose, too, that the population standard deviation is unknown, but the sample has a standard deviation of 5.2 years.
a. Show the 95%, the 99% and the 80% intervals that would be appropriate here.
b. What additional assumption about the population would have to be made?

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