Statistics for the Behavioral Sciences by Frederick J. Gravetter, Larry B. Wallnau ISBN 10: 1305504917 ISBN 13: 9781305504912

338 CHAPTER 11 | The t Test for Two Related Samples
in the samples must be matched one-to-one before you can use the statistical techniques
in this chapter.
TABLE 11.1
An example of the data from a repeated-measures or a matched-subjects
study using n 5 5 participants (or matched pairs).
Participant or
Matched Pair
First
Score
Second
Score
#1 12 15 d the 2 scores for
#2 10 14 one participant or
#3 15 17 one matched pair
#4 17 17
#5 12 18
Now we will examine the statistical techniques that allow a researcher to use the
sample data from a repeated-measures study to draw inferences about the general
population.
LEARNING CHECK
1. A researcher conducts an experiment comparing two treatment conditions and
obtains 20 scores in each treatment. Which design would require the smallest
number of subjects?
a. a repeated-measures design
b. an independent-measures design
c. a matched-subjects design
d. either an independent-measures or a matched-subjects design
2. For an experiment comparing two treatment conditions, an independent-measures
design would obtain ____ score(s) for each subject and a repeated-measures design
would obtain ____ score(s) for each subject.
a. 1, 1
b. 1, 2
c. 2, 1
d. 2, 2
3. For a research study comparing two treatments with n = 10 scores in each
treatment, which design would require the largest number of participants?
a. repeated-measures
b. independent-measures
c. matched-subjects
d. independent-measures or match-subjects (both use the same number)
ANSWERS
1. A, 2. B, 3. D