Chapter 11
t
-Test for Two Related Samples
PowerPoint Lecture Slides
Essentials of Statistics for the Behavioral
Sciences
Seventh Edition
by Frederick J Gravetter and Larry B. Wallnau
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Chapter 11 Learning Outcomes
Concepts to review
•
Introduction to the
t
Statistic
–
Estimated standard error
–
Degrees of freedom
–
t
Distribution
–
Hypothesis test with
t
statistic
•
Independent Measures Design
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11.1
Introduction to
Repeated-Measures Designs
•
Repeated measures design
–
Also known as
within-subjects design
–
Two separate scores are obtained for each
individual in the sample
•
Same subjects are used in all treatment
conditions
•
No risk of the treatment groups differing from
each other significantly.
Matched-Subjects Design
•
Approximates the advantages of a repeated-
measures design
•
Two separate samples are used
–
Each individual in a sample is matched one-
to-one with an individual in the other sample.
–
Matched on relevant variables
•
Participants are not identical to their match
–
Ensures that the samples are equivalent with
respect to some specific variables.
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Related-samples Designs
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- Spring '11
- CynthiaIngle
- Psychology, Statistics, Null hypothesis, Statistical hypothesis testing, Statistical significance, Statistical power, Repeated-Measures Designs
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