Types of dependent variables
Self-report
Behavioral
Physiological
Why use >1 DV?
More efficient
More generalizable
Threats to internal validity
History
Maturation
Testing
Instrumentation
Regression to the mean
Selection
Mortality
Main effects and interactions
Main effect--difference in one IV
Interaction--effects of one IV depend on another IV
Examples
Females are less likely to conform than males on stereotypically female topics, whereas males are less likely than females to conform on stereotypically male topics.
The female leadership style is more relationship-oriented than the male leadership style.
Examples
People with secure attachments have longer lasting romantic relationships than people with insecure attachments.
Students preferred a highly attractive person to a less attractive person as a dating partner, but only if the highly attractive person was seen as available.
Examples
If a stimulus is initially positive, being exposed to it over and over makes us even less positive towards it. If it is initially negative, being exposed to it over and over makes us even less positive.
Main effects and interactions
as words
as numbers
as graphs
as inserting numbers