Chapter 1.1, Problem 1.15E

a)

To determine

To create an example about observational study.

Answer to Problem 1.15E

This is an observational study.

Explanation of Solution

First need to understand about the observational study:

Observation study: In an observational study, measure or survey members of a sample without trying to affect them.

Suppose a group of high school students is selected and asked about opinion about the school rules and their recommendations. In this study, we only observing the opinion of students without influencing any treatment.

b)

To determine

To create an example about experimental study.

Answer to Problem 1.15E

This is an experimental study.

Explanation of Solution

First need to understand about the experimental study:

Experimental study: Assigning people or things to groups and applying some treatment to one group, while the other group does not receive the treatment.

Suppose the 2 groups of high school students are taking. One group having the training about the personality development and other group having no training. Researcher wants to compare the behavior of students. In this case one group imposed for training therefore, this is experimental study.