Age. Suppose you select a random sample of 18 people from a population. It is known that the mean age of the population is 32.0.

For your sample, the mean age was 28.0 and the standard deviation was 3.2. Is the mean age of your sample significantly different from the mean age of the population?

Extending the Concepts and Skills Population and Sample Standard Deviations. In Exercises 3.219–

3.221, you examine the numerical relationship between the population standard deviation and the sample standard deviation computed from the same data. This relationship is helpful when the computer or statistical calculator being used has a built-in program for sample standard deviation but not for population standard deviation.