Chapter 13, Problem 14E

a)

To determine

To find the type of the study.

Answer to Problem 14E

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. That is, all the subjects were exposed to a cold virus and then received a herbal compound or sugar solution.

b)

To determine

To find the subjects.

Answer to Problem 14E

The volunteers exposed to a cold virus.

Explanation of Solution

The subjects are volunteers who exposed to a cold virus.

c)

To determine

To find the factors and number of levels.

Answer to Problem 14E

Herbal compound with 2 levels.

Explanation of Solution

In this study, the experiment having 1 factor which have 2 levels. The levels are herbal compound and sugar solution.

d)

To determine

To find the number of treatments.

Answer to Problem 14E

2

Explanation of Solution

In this study, there are 2 treatments.

e)

To determine

To find the response variable.

Answer to Problem 14E

The response variable is cold severity.

Explanation of Solution

In this study, the response variable is severity of cold symptoms.

f)

To determine

To identify the type experiment.

Answer to Problem 14E

Completely randomized experiment.

Explanation of Solution

The experiment is completely randomized because subjects were randomly assigned to a treatment.

g)

To determine

To identify whether the study is blinded or double blinded.

Answer to Problem 14E

The experiment is not blinded.

Explanation of Solution

The experiment is Blinding, because the sugar solution was used as a placebo which helps to knowing whether they had received the herbal compound.

h)

To determine

To explain the scope and conclusions.

Explanation of Solution

There is no evidence that the herbal compound was more effective than the sugar solution.