PSYCH 100B Lecture Notes - Lecture 7: Factorial Experiment
Document Summary
Most factorial designs have 2 ivs but it"s possible to have more. 2 x 3 x 2 12 conditions, 3 ivs, with 2 levels, 3 levels, and 2 levels. Iv 2 within between between between within within between. Specifics of the study depends on the questions you ask. Marginal means: average across just one level of iv. When there is a radio present, people do better on multiple choice exams. When there is no radio present, people do considerably better on multiple choice exams. When you take a multiple choice exam, you do better with no radio. When you take an essay exam, you equally well with or without radio. Need to conduct post hoc tests to determine significance of interactions. If we had had 3 levels for the study environment. If we get a significant result, we know there is a difference but we don"t. Between subjects independent samples t test. Within subjects dependent samples t test.
