EXAMPLE 15 Cluster sampling

Using Table 10, consider each division to be a cluster. Construct a cluster sample of the teams in the Eastern Conference by randomly selecting two of the three clusters (divisions).

Solution

Suppose that we randomly select our clusters to be the Atlantic Division and the Southeast Division. Our cluster sample then consists of all the teams in both of these divisions, as follows:

NOW YOU CAN DO

Exercises 19 and 20.