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Why is it so important to study interactions and not just main effects? Consider the following example: An experiment was designed to test a hypothesis that stated that high-drive participants would be able to learn a simple task much more quickly than would low-drive participants. The hypothesis further stated that on a difficult task the opposite result would be found-low-drive participants would learn the task more quickly. The experimenter's operational definition of drive was each participant's score on the Manifest Drive Scale (MDS). Twenty people who scored high on the scale (high-drive) and 20 people who scored low on the scale (low- drive) were given a difficult task to learn. The low-drive group learned the task more quickly than did the high-drive group, and the experimenter concluded that the hypothesis was correct. • What is the the problem with this interpretation? • How could we correctly research the hypotheses? (Describe how you would design the study) • Describe another example where the conclusion could be misleading because of a failure to examine interaction effects.

Why is it so important to study interactions and not just main effects? Consider the following example: An experiment was designed to test a hypothesis that stated that high-drive participants would be able to learn a simple task much more quickly than would low-drive participants. The hypothesis further stated that on a difficult task the opposite result would be found-low-drive participants would learn the task more quickly. The experimenter's operational definition of drive was each participant's score on the Manifest Drive Scale (MDS). Twenty people who scored high on the scale (high-drive) and 20 people who scored low on the scale (low- drive) were given a difficult task to learn. The low-drive group learned the task more quickly than did the high-drive group, and the experimenter concluded that the hypothesis was correct. • What is the the problem with this interpretation? • How could we correctly research the hypotheses? (Describe how you would design the study) • Describe another example where the conclusion could be misleading because of a failure to examine interaction effects.

Ciccarelli: Psychology_5 (5th Edition)
Ciccarelli: Psychology_5 (5th Edition)
5th Edition
ISBN:9780134477961
Author:Saundra K. Ciccarelli, J. Noland White
Publisher:Saundra K. Ciccarelli, J. Noland White
Chapter1: The Science Of Psychology
Section: Chapter Questions
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• Why is it so important to study interactions and not just main effects? Consider the following example: An experiment was designed to test a hypothesis that stated that high-drive participants would be able to learn a simple task much more quickly than would low-drive participants. The hypothesis further stated that on a difficult task the opposite result would be found-low-drive participants would learn the task more quickly. The experimenter's operational definition of drive was each participant's score on the Manifest Drive Scale (MDS). Twenty people who scored high on the scale (high-drive) and 20 people who scored low on the scale (low- drive) were given a difficult task to learn. The low-drive group learned the task more quickly than did the high-drive group, and the experimenter concluded that the hypothesis was correct. • What is the the problem with this interpretation? • How could we correctly research the hypotheses? (Describe how you would design the study) • Describe another example where the conclusion could be misleading because of a failure to examine interaction effects.
Transcribed Image Text:• Why is it so important to study interactions and not just main effects? Consider the following example: An experiment was designed to test a hypothesis that stated that high-drive participants would be able to learn a simple task much more quickly than would low-drive participants. The hypothesis further stated that on a difficult task the opposite result would be found-low-drive participants would learn the task more quickly. The experimenter's operational definition of drive was each participant's score on the Manifest Drive Scale (MDS). Twenty people who scored high on the scale (high-drive) and 20 people who scored low on the scale (low- drive) were given a difficult task to learn. The low-drive group learned the task more quickly than did the high-drive group, and the experimenter concluded that the hypothesis was correct. • What is the the problem with this interpretation? • How could we correctly research the hypotheses? (Describe how you would design the study) • Describe another example where the conclusion could be misleading because of a failure to examine interaction effects.
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