One advantage of experiments is that they ___________.
__________ variables are manipulated by the experimenters.
A(n) __________ refers to a substance or treatment that is often used in an experiment but does not have an actual medicinal or experimental benefit.
In a __________ study, the subjects do not know to which group they are assigned, but the researchers are aware of the subjects’ group assignments.
If everyone in the population has an equal chance of inclusion in a study, then one would say that the study used a ___________ sampling technique for the study.
The degree to which the findings of a study may be applied to a larger population represents how ___________ a sample is.
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