PSYB01H3 Chapter Notes - Chapter 8: Repeated Measures Design, Confounding, Random Assignment
Document Summary
Independent groups design groups are made equivalent by randomly assigning participants to experience only one of the various conditions of the iv = participate in only 1 group. Repeated measures design participants are assigned to participate in all levels of the iv. When there are only 2 levels of the iv, the design looks like this: 3 main reason why researchers may add a pretest: When participants may drop out of the study. Mortality the drop out factor in experiments/loss of participants who decide to leave exp; this is a threat to internal validity when related to nature of exp manipulation. 161 - 162 for the solomon four-group design. W/ this design individual differences can be seen and explained b/c of this we are much more able to detect an effect of the iv on the dv, if one exists. Conditions are identical because person is own control group.
