The internal validity of single-case research is enhanced when the
A) researcher's clinical judgment is used to assess the effectiveness of the treatment.
B) research includes multiple cases rather than just one.
C) research focuses on an acute problem.
D) effect of the treatment takes some time to appear.

Question

Quizplus · Accepted Answer

Multiple cases in research enhance internal validity by allowing comparisons and replications within the study, which strengthens the evidence that the observed effects are due to the intervention rather than other factors.

The Internal Validity of Single-Case Research Is Enhanced When the