Dr. Harris conducts a two-factor experiment where she plots her results on a graph and notices that the lines on the graph are not parallel (which is confirmed when she runs a statistical analysis). This pattern suggests the presence of:
A) only one main effect.
B) two main effects.
C) an interaction between two independent variables.
D) None of the answers is correct.

Question

Quizplus · Accepted Answer

When the lines on a graph are not parallel in a two-factor experiment, it indicates an interaction between the two independent variables, meaning the effect of one variable depends on the level of the other variable.

Dr Harris Conducts a Two-Factor Experiment Where She Plots Her