PSYCH 312 1st Edition Lecture 13Outline of Last Lecture I. 3 classes of experimental designsa. Between subjectb. Within subjectc. MixedII. Types of between subject designsa. Completely randomizedb. Multilevel completely randomizedc. Factorial Outline of Current Lecture I. Factorial designsII. Between-subject factorial designsIII. 2 x 3 factorial designIV. Test for 3 effectsCurrent Lecture -Factorial designsoExamines the effects of 2 or more IV's (factors) on the same DV in the same study oEach IV must have at least 2 levels (IV, no IV) but could have moreoNOTE:-In factorial designs, factors (IV) can be run:-Between-subjects-Within-subjects-Mixed (between & within)-Between-subject factorial designsoExample: does effect of music on problem solving performance depend on age?-Factor 1: age-Young, old-Factor 2: music-Rock, classical, no music-Called a "2 x 3 factorial design"-2 x 3 between subject factorial design Rock Classical No musicYoung 20 20 20Old 20 20 20-Between subject factorial designsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.oAnalysis: Two-way between subject ANOVA-Test for 3 effects-Main effect for factor 1 (age) (f ratio)-Does age alone affect performance?-If significant-no t-test needed (only 2 levels)-Main effect for factor 2 (music) (f ratio)-Does music alone affect performance?-If significant-Follow with independent t-test to find which levels differ (e.g., Tukey HSD)-Music x age interaction (f ratio)-Is any effect of music on performance dependent upon age-If significant-Follow with independent t-test to find which of 6 conditions differ from each
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