As a result of your answer to Exercise 8.83, state the exact distribution to use when calculating the confidence interval.

Exercise 8.83,

In words, define the random variable X̅ .

The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was 30.4. We are interested in the true mean age for Winter Foothill College students. Let X = the age of a Winter Foothill College student.