Chapter 11, Problem 4P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

A researcher conducts an experiment comparing two treatment conditions with 20 scores in each treatment condition.

a. If an independent-measures design is used, how many subjects are needed for the experiment?

b. If a repeated-measures design is used, how many subjects are needed for the experiment?

c. If a matched-subjects design is used, how many subjects are needed for the experiment?

**a.**

To determine

The numbers of participants needed for the independent-measures design.

Explanation

**Given info:**

The study uses independent-measures design and numbers of scores in each treatment are 20.

**Calculation:**

Let *n* be the total numbers of participants.

Since, both the groups are formed independently in independent-measures design participants in both the groups are different. Thus, total numbers of participants needed for the study will be the sum of total numbers of participants in each treatment...

**b.**

To determine

The numbers of participants needed for the repeated-measures design.

**c.**

To determine

The numbers of participants needed for the matched-subjects design.

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