Rhonda Designs an Experiment in Which Half of Her Participants

Multiple Choice

Rhonda designs an experiment in which half of her participants are randomly assigned to view a sad movie and half view a comedy, but all participants fill out three mood surveys at one, two, and three weeks after the movie. This is an example of

A) a between-participants design.
B) a within-participants design.
C) a non-equivalent posttest-only design.
D) a mixed-model, factorial design.