Question

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

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

$n=25$

Step-by-step solution

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).

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 $30.4$.