PSYC 201W Chapter Notes - Chapter 11: Demand Characteristics, Time Point, Dependent And Independent Variables
24 Jul 2017
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Selection interaction: when one group experiences a particular threat to validity but the other group does not nonequivalent -weakest: posttest-only. One-group posttest-only design: an employer administers a workplace intervention on motivation to all of her employees and then assesses worker productivity after the intervention. One-group pretest-posttest design to assess the ability of an aggression management program to lower hostility. The researcher uses the same psychological inventory at each time point to measure hostility. would be susceptible to all of the following threats to validity except testing one-group pretest-posttest: before and after the intervention. Simple interrupted time-series: with a nonequivalent control group in which the dv is measured several times at periodic intervals both before and after treatment (the strongest) Difficult to control for demand characteristics and placebo effects. Not an advantage of a pretest-posttest with a nonequivalent control group design: Not likely to be the goal of a program evaluation: identifying funding sources for a program.
