The experimental approach to research starts with groups that are ____ on significant variables, while the ex post facto approach starts with groups that are ____ on significant variables.
A) different; equivalent
B) equivalent; different

Question

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The experimental approach to research typically involves creating groups that are equivalent on significant variables at the start of the experiment, to ensure that any differences observed can be attributed to the manipulation of the independent variable. The ex post facto approach, on the other hand, starts with groups that are already different on significant variables, as it investigates the effects of these differences after they have occurred.

The Experimental Approach to Research Starts with Groups That Are