PSY 310 Study Guide - Midterm Guide: Total Variation, Naturalistic Observation, Internal Validity

• School: Stony Brook University
• Department: Psychology
• Course: PSY 310

Document Summary

Internal validity: whether your iv is what caused a change in your dv. History: any event, other than the iv, that occurs between dv measurements. Maturation: changes in participants that occur over the course of an experiment. (ie: lost motivation, boredom, tired) Testing: measuring the dv multiple times may change the measurement. Practice effect: measurements change just from repeating the test. Reactive measures change the behavior in question (ex: asking ss about how they feel about certain race. Ss may change answer based on researcher"s race) Nonreactive example ask ss who they"d vote for, use one-way mirror or naturalistic observation. Instrumentation when the instrument used to measure the dv becomes outdated. Statistical regression when ss who receive extreme scores receive less extreme scores in subsequent measurements. Mortality: occurs when too many participants from a group drop out of the experiment so groups are no longer equal.