Chapter 12.2, Problem 58E

(a)

To determine

To find: the kinds of sampling method to use.

Explanation of Solution

The 1100 teachers are in forty different sessions and therefore tracking down every single teacher would require a lot of time and effort.

If would be easier to use cluster sampling with every different session as a cluster, then all teachers from a few of these clusters would be in the sample. This sampling method would be a lot easier than a simple random sample.

(b)

To determine

To find: the kinds of sampling method to use.

Explanation of Solution

There is including teachers from each subject area in the sample and then it is best to use stratified random sampling.

Stratified random sampling draws simple random sample from independent subgroups, where subgroups would be every subject area in this case.

This allows us to compare the subject area to the proportion of teachers who have tattoos.