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Chapter 8: Q. 26 (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.

In words, define the random variable X炉.

Short Answer

Expert verified

X炉is the mean.

Step by step solution

01

Given Information

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.

02

Explanation

The mean is the average of a data set. The sample mean symbol is X炉, pronounced 鈥渪 bar鈥�. The sample mean is an average value found in a sample.

The mean age for the sample of twenty-five Winter students isX炉=30.4

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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.

Construct a 95%Confidence Interval for the true mean age of Winter Foothill College students.

How much area is in each tail? 伪2=______?

The 95% confidence interval is:__________________.
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