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Chapter 1: Q35BB (page 1)

In Exercises 33–36, identify which of these designs is most appropriate for the given experiment: completely randomized design, randomized block design, or matched pairs design

West Nile Vaccine Currently, there is no approved vaccine for the prevention of infection by West Nile virus. A clinical trial of a possible vaccine is being planned to include subjects treated with the vaccine while other subjects are given a placebo.

Short Answer

Expert verified

The most appropriate experimental design for the given data is a completely randomized design.

Step by step solution

01

Given information

A clinical trial is performed to examine the efficacy of a vaccine by administering it to a certain number of subjects while the remaining receives a placebo.

02

Types of experimental designs

When the participants of a sample occur in pairs, and one participant from each pair receives treatment X while the other participant receives treatment Y, amatched-pairs design is the most suitable experimental design.

Grouping together homogeneous units into blocks is done under the randomized block design.

The random designation of subjects to units to analyze the results is done under acompletely randomized design.

03

Identification of the type of design

Since the experiment consists of randomly administering the vaccine to one part of the sample while the other part receives a placebo without any grouping or pairing, it can be best analyzed by acompletely randomized design.

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