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Pre-experimental designs?? a. are the weakest experimental designs. b. are excellent for drawing causal inferences. c. control for most sources of external invalidity. d. control

Pre-experimental designs??

	a.	are the weakest experimental designs.
	b.	are excellent for drawing causal inferences.
	c.	control for most sources of external invalidity.
	d.	control for most sources of internal invalidity.

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