Chapter 13, Problem 7E

a)

To determine

To find the type of the study.

Answer to Problem 7E

This is an experimental study.

Explanation of Solution

First need to understand about the experimental study and observational 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.

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

This is an experimental study because the treatment is imposed on the subjects.

b)

To determine

To find the subjects.

Answer to Problem 7E

30 patients with bipolar disorder.

Explanation of Solution

In this study, the subjects were 30 patients with bipolar disorder.

c)

To determine

To find the factors and number of levels.

Answer to Problem 7E

The factor which is omega-3 fats from fish oil and levels are high dose and no dose.

Explanation of Solution

In this study, the experiment having 1 factor which is omega-3 fats from fish oil. The levels are high dose and no dose.

d)

To determine

To find the number of treatments.

Answer to Problem 7E

2

Explanation of Solution

In this study, the number of treatments are 2.

e)

To determine

To find the response variable.

Answer to Problem 7E

The response variable is improvement.

Explanation of Solution

In this study, the response variable is improvement. There is no indication of the measurement of this variable.

f)

To determine

To identify the type experiment.

Answer to Problem 7E

Design is not specified.

Explanation of Solution

The study does not specific any design.

g)

To determine

To identify whether the study is blinded or double blinded.

Answer to Problem 7E

The experiment is blinded.

Explanation of Solution

The experiment is blinded because the use of a placebo keeps patients from knowing whether or not they received the omega-3 from fish oils. It is not sure that the study is double blinded.

h)

To determine

To explain the scope and conclusions.

Explanation of Solution

This study can determine whether or not omega-3 from fish oils causes improvements in patients with bipolar disorder.