PSYCH291 Study Guide - Final Guide: Experiment, Construct Validity, Internal Validity

• School: University of Waterloo
• Department: Psychology
• Course: PSYCH291
• Professor: Joanne Wood

Document Summary

Mortality is the only plausible threat to internal validity for tes. All ogptpt threats except for mortality can"t be a threat to tes because they can"t explain differences among groups. With internal validity, the issue is not whether the process has occurred. It"s about whether the process could have led to results obtained. In te: 1. the conditions are being run in parallel, at the same time. Participants are run individually or in small or mixed groups (not all the time, though). Ps in the conditions experience the same things except for the things being manipulated. Random assignment: creates condition that is equal before the manipulation, equal in terms of individual differences (related or not related to the research). Prestest advantages: can examine pretest scores to make sure ra works at least for that variable, makes statistical test more sensitive more likely to show effects.