Chapter 13, Problem 17E

a)

To determine

To find the type of the study.

Answer to Problem 17E

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 17E

The people experiencing migraines.

Explanation of Solution

The subjects studied were people experiencing migraines.

c)

To determine

To find the factors and number of levels.

Answer to Problem 17E

The pain reliever and water temperature with 2 levels of each.

Explanation of Solution

In this study, the factors are pain reliever and water temperature. Therefore, for each two factors, there are 2 levels each. The levels of pain reliver are pain reliever or placebo. The levels of water temperature are ice water and regular water.

d)

To determine

To find the number of treatments.

Answer to Problem 17E

4

Explanation of Solution

In this study, there are 4 treatments.

e)

To determine

To find the response variable.

Answer to Problem 17E

The response variable is level of pain relief.

Explanation of Solution

In this study, the response variable is level of pain relief.

f)

To determine

To identify the type experiment.

Answer to Problem 17E

Completely randomized.

Explanation of Solution

The experiment used a completely randomized design.

g)

To determine

To identify whether the study is blinded or double blinded.

Answer to Problem 17E

The subjects are used blinded design for pain reliever but not for water factor.

Explanation of Solution

The subjects are blinded to the pain reliever though the use of the placebo. However, the subjects are not blinded to the water factor. They know whether they are drinking ice water or regular water.

h)

To determine

To explain the scope and conclusions.

Explanation of Solution

As placebo effect shows to pain reliever but not to the ice water. Therefore, the placebo effect may cause of any relief seen due to ice water.