multiple choice questions for Objective 8

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Chapter 9

This activity contains 6 questions.

The best way to control for extraneous variables in research studies is

	randomization
	valid and reliable instrumentation.
	avoiding all threats to external validity.
	using intact groups.

The best way to control environmental variables is to

	randomly select each variable.
	hold the variables constant by only selecting one level of it.
	match variables.
	use ANCOVA to adjust for differences.

The use of matching effectively creates

	non-equivalent groups.
	high levels of external validity.
	equivalent groups.
	a placebo effect.

The cost of using homogeneous groups to control extraneous variables is

	a loss of external validity.
	a loss of internal validity.
	creating equivalent groups.
	creating non-equivalent groups.

Which design allows subjects to act as their own controls?

	The static group design
	Pretest-posttest control group design
	Time series design
	Posttest only control group design

The purpose of ANCOVA is to

	statistically control for pretest differences between groups.
	bias the results.
	match subjects on a statistical basis.
	create homogenous subgroups.

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