PSYC 2900 Study Guide - Midterm Guide: Formal System, Latin Square, Weighted Arithmetic Mean
Document Summary
Control variable experimenter holds constant on purpose (ex: temp in room) Within-group designs: each participant is presented all levels of the independent variable covariance & temporal precedence are established. Advantages: ensures that the participants in the treatment groups are equivalent, require less participants. Disadvantages: order effects (can be fixed with counter balancing) Once you teach someone something you can not revert back to the baseline. People see all levels and then change the way they normally act based on suspicion. Independent-groups: each level of the independent variable has different participants. Post-only design: tested on the dependent variable one. Pretest-posttest design: tested on the dependent variable before and after exposed to the independent variable (only use if there will be no suspicions on what you are testing) Concurrent-measure designs: participants are exposed to all levels of the independent variable at roughly the same time and measured on the dependent variable once.