# 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 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?

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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