Unformatted text preview: Page 2 of3 is 2, you should always try to have more to make sure that the behavioral system you're dealing with is continuous. Factorial Design When studies have more than one independent variable, they are called "factorial designs". For example, suppose you were interested in test performance of students (males and females) when they take tests at different times ofthe day, one variable would be Gender with two levels (male and female) and one variable would be Time of Day with three levels. (8 a.m, noon, 6 p.m.). This would be called a 2 x 3 ("two by three") design. In class we discussed a 2 x 3 design that appeared on the second midterm: Treatment1 Trealment2 Trealment 3 Tmalment4 Trealmenl5 Treatment6 Notice that in this study, the two variables are Vitamin E and Vitamin C. It is a between groups design (see below). . We use factorial designs because more than one hypothesis can be tested about what is important and alternative interpretations (confounding variables) can be included in tile design. Mostand alternative interpretations (confounding variables) can be included in tile design....
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This note was uploaded on 03/05/2010 for the course PSYCH psych 7 taught by Professor Revlin during the Fall '09 term at California State University , Monterey Bay.
- Fall '09