Relationship: Are applicants judged differently depending on their relationship with their companion?.
Weight: Are applicants judged differently depending on the weight of their companion?.
There are three effects of interest in this experiment:
If so, there would be an interaction between the obesity factor and the relationship factor.
Perhaps there is more prejudice against a person with an obese companion if the companion is a girl friend than if she is just an acquaintance.
For example, it is possible that the effect of having an obese companion would differ depending on the relationship to the companion.
There is an interaction when the effect of one variable differs depending on the level of a second variable.
It allows a test of the interaction between the variables.
Moreover, there is a much bigger advantage than efficiency for including two variables in the same study:.
However, it is more efficient to conduct one study that includes both independent variables.
One approach would have been to conduct two separate studies, one with each independent variable.
whether the companion was a girl friend or just an acquaintance.
whether the companion was obese or of typical weight.
Two independent variables were investigated:.
In the Bias Against Associates of the Obese case study, the researcher was interested in whether the weight of a companion of a job applicant would affect judgments of a male applicant's qualifications for a job.
Compute the source of variation and df for each effect in a factorial designīasic Concepts and Terms Bias Against Associates of the Obese Example.
State the relationship between simple effects and interaction.
Define main effect, simple effect, interaction, and marginal mean.