8. Which of the following steps would improve the external validity of an analogue experiment of subclinical depression in college students?
(A). Include a no-treatment control group.
(B). Perform statistical analyses on the results.
(C). Use clinically depressed patients.
(D). Include several types of therapy.

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統計: A(0), B(1), C(0), D(0), E(0) #3007267