Discussion
Assertion (A) : An experimental design permits inferences about cause and effect.
Reason (R) : By manipulating the independent variable, the researcher determines the effect, it has, on the dependent variable.
Codes :
Answer: D
Both statements are correct. An experimental design permits inferences about cause and effect, because the researcher manipulates the independent variable and observes the effect it has on the dependent variable while controlling other factors.
The reason is the way in which the design gives that inference. The options that call either statement wrong are rejected. Because the researcher controls the independent variable and assigns subjects, other explanations are reduced, which is the reason cause can be inferred.
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