PSY-2150 Study Guide - Quiz Guide: Internal Validity, Measuring Instrument, Needs Assessment

• School: Vanderbilt University
• Department: Psychology (A&S)
• Course: PSY-2150
• Professor: Sandberg Elisabeth

Document Summary

Attrition: a loss of participants from the study. Contamination: occurs when knowledge, services, or other experiences intended for one group are unintentionally received by another group. Efficiency assessment: weighs the program"s benefits and effectiveness in relation to its costs, to determine whether it is an efficient method for addressing the problem. History: events that occur while a study is being conducted, and that are not a part of the experimental manipulation or treatment. Instrumentation: changes that occur in a measuring instrument during the course of data collection. Maturation: ways in which people naturally change over time, independent of their participation in a study. Needs assessment: determines whether there is a need for a social program and the general steps required to meet that need. One-group posttest-only design: a treatment occurs and afterward the dependent variable is measured once ( x o1 )