Chapter 4, Problem 13PT

a.

To determine

To explain: The reason of not using simple random method in the survey.

Explanation of Solution

Given:

It has been found in the survey that there are 34% adults who believe that steroid is used by the MLB players to increase their performance. Also, there are 36% adults think that steroid is used by players and 80% did not have no opinion.

The provided survey is not a simple random people because the person not having the telephone are not be included in the survey. All the people do not have equal chances of being chosen thus, the sampling method is not simple random sample.

b.

To determine

To explain: The reason of selecting one adult from each household to respond the survey.

Explanation of Solution

If call is made then there is a possibility that few adults would take the call more frequently than others and there is a possibility to have the differences in the opinions.

c.

To determine

To explain: The ways in which under coverage could lead biasness

Explanation of Solution

Here all the people have not been included in the survey because of the not having the telephones to all the individuals. Thus, large portion of the population has been missed that may cause biasness.