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Chapter 8: Q. 24 (page 478)

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.

role="math" localid="1648389122287" n=____

Short Answer

Expert verified

We suppose that twenty-five Winter students were randomly selected, then

n=25

Step by step solution

01

Concept Introduction

Population standard deviation looks at the square root of the variance of the set of numbers. It's used to determine a confidence interval for concluding (such as accepting or rejecting a hypothesis).

02

Explanation

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. The mean age for the sample was 30.4.

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