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Single Factor Designs

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Between-Subjects Between Subjects, Two Levels<br />

• Independent Groups<br />

– random a do assg assignment, e t, many a y pa participants tcpa ts<br />

– e.g., typical experiments in social Psychology<br />

– independent groups t-test<br />

• Matched Groups<br />

– smaller number of participants<br />

– some factor strongly correlates with DV<br />

– e.g., sleep deprivation and suggestibility study<br />

– with one-to-one matching, use dependent groups t-test<br />

• Nonequivalent groups<br />

– subject variable<br />

– match the groups on other characteristics<br />

• bbut t not t necessarily il a one-to-one t matching thi<br />

– e.g., neuropsychology

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