PSY1022 Lecture Notes - Lecture 8: Random Assignment, Experiment, Interrupted Time Series

• School: Monash University
• Department: Health Sciences - Psychology
• Course: PSY1022

Document Summary

Prescribed readings: chapter 6 experimental design i (p. 138-147; Experimental design i & variations on experimental design. Four basic research designs can be called single factor designs, with the term factor meaning independent variable" here. All four of these single factor designs have one independent variable. Independent groups design (if simple random assignment is used to create equivalent groups) Matched groups design (if a matching procedure followed by random assignment is used) This design is called an ex post facto design because the subjects in the study are placed into the groups after the fact" of their already existing subject character istics. Each participant in the study experiences each level of the independent variable (e. g. , is measured repeatedly). In research, members of a placebo control group are led to believe they are receiving treatment when in fact they aren"t. Waitlist control groups are often used in research designed to assess the effectiveness of a program or psychotherapy on individuals in need.