Chapter 11, Problem 4P

### Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

Chapter
Section

### Essentials of Statistics for the B...

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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