Renee conducts a single-case experiment in which she changes two variables simultaneously. Renee has
A) utilized a factorial design.
B) utilized a multiple-groups design.
C) controlled for several threats to internal validity.
D) a confound.

Question

Quizplus · Accepted Answer

Changing two variables simultaneously introduces a confound, making it difficult to determine which variable is responsible for any observed effects.

Renee Conducts a Single-Case Experiment in Which She Changes Two