Why do researchers change only one variable at a time in single-case experiments?
A) There are not enough participants to change multiple variables at once.
B) There is increased external validity when only one variable is changed at a time.
C) Changing multiple variables at once creates confounds in the experiment.
D) The statistical techniques required to analyze the data are very complex when more than one variable is changed at a time.

Question

Quizplus · Accepted Answer

Changing multiple variables at once can introduce confounding variables, making it difficult to determine which variable is responsible for any observed changes in the outcome.

Why Do Researchers Change Only One Variable at a Time