Repeated Measure and Factorial Designs Psychology 291 November 27, 2012

Previous week’s experiment Hypothesis: Participants in the self-reflection condition will report significantly less willingness to perform illegal activities if invisible than participants in the control condition.

Participants 41 Participants total Experimental condition n = 19 Control condition n = 22

Proposed Results Participants in the self-reflection condition reported willingness to perform illegal activities significantly less than participants in the control condition. Notice: for simple hypotheses there will be a great deal of redundancy between your hypothesis and your proposed results. For more complex hypotheses (i.e. Factorial or Mixed designs) you must indicate expected differences and non-differences between all possible groups You should write your results as if you found significant differences otherwise you will have nothing to discuss in your Discussion section

Results outputs An Independent Samples t test was run comparing willingness to perform illegal activities between the self-reflection condition and control condition. No significant differences were found, t (39) = 1.419, p >.05.

Factorial Designs Designs employing more than one independent variable and thus allowing researchers to identify interactive effects among independent variables Experiments with Quasi-independent variables are necessarily FD FD are described by the number of levels of each IV e.g. 2 x 2 x 3 How many IVs are there in this study? How many levels of each? How many groups would there be in total?

Sex (2)Drug (3)Dose (2)Result Male Drug A High Low Drug B High Low Placebo Female Drug A High Low Drug B High Low Placebo

Repeated Measures Designs Any design in which participants are tested more than once. Ps may be tested repeatedly at different levels of IV or in same condition repeatedly (i.e. trials)

RM as Different levels of IV MeditationYogaAerobic Exercise Stress Level Researchers wanted to investigate the effect of different types of interventions on stress levels in Participants. Participants were involved in a 6 week study where they were guided in three different interventions. The orders were counterbalanced with a 2 week break between sessions.

Alternative guided exercise classes are becoming more popular forms of exercise however many people attend only a single class before deciding whether or not to regularly attend the class. For classes with elaborate routine based classes (e.g. Zumba), instructors were interested in changes to the number of calories burned during a session as attendees became more familiar with the routines. Participants were asked to wear heart rate monitors throughout the class to determine the number of calories burned. RM as Effect of Trials Class 1Class 2Class 3 Calories Burned

You may use the rest of this period to work on Assignment 4