Chapter 10.1, Problem 1E

a.

To determine

To find: Whether the provided problem is about comparing proportions or comparing means.

Answer to Problem 1E

It is about comparing proportions.

Explanation of Solution

Given:

We should structure an investigation to discover. Well select an arbitrary example Of Toyota proprietors and a different irregular example of 400 Nissan proprietors.

Since, two categories are involved in this problem, that is, Yes or No. It implies that collected data is categorical the mean cannot be computed here. Thus, it could not be concluded that the problem is about proportions.

b.

To determine

To find: The study that is being used here.

Answer to Problem 1E

Observational study.

Explanation of Solution

Since, the observational study does not influence the outcome and in the provided case no outcomes have been influenced here. Therefore, the study is observational.