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Back to 8.1 A Single Population Mean using the Normal Distribution

8.1 Exercise 40

Avg difficulty 2.5


Use the following information to answer the next 14 exercises: 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.

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

OpenStax Introductory Statistics 2e, 8.1 A Single Population Mean using the Normal Distribution, exercise 40

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Adapted from Introductory Statistics 2e © 2023 Rice University. Licensed under CC BY 4.0. Source: Introductory Statistics 2e. Imported at revision 50ec917.