PSY 310 Study Guide - Midterm Guide: Statistical Inference, Standard Deviation, Descriptive Statistics

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

Document Summary

Nine threats to internal validity: history: if historical events that could affect the dv occur between 2 measurements, maturation: if participants change simply due to the passage of time. First block effects: testing: if participants respond different on the second measure of a dv simple because they"ve been tested before. Mortality : if different kinds of people drop of out the experiment at different rates: diffusion or imitation of treatments: if participants learn about treatments of other groups and copy them. Interactions with selection: if participants in different groups show differences on another variable (i. e. , maturation, history, or instrumentation) that vary systematically by groups. Threats to external validity (due to our methods) Interaction of selection and treatment: when findings apply only to the groups selected for the experiment. Threats to external validity (due to experimenter/theoretical perspective/ethnocentrism: lack of focus on understanding females, minorities, and non-americans.