In an experiment, to control a variable means to vary its level systematically.
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Q14: All extraneous variables are confounding variables.
Q15: In a within-subjects experiment, each participant is
Q16: Manipulation checks are typically done at the
Q17: People who volunteer to participate in research
Q18: Experiments involve the random selection of participants.
Q20: Fatigue effects can become a problem in
Q21: Which of the following researchers probably worries
Q22: When are manipulation checks usually done?
A) at
Q23: In an experiment, the participants' ages would
Q24: Why are confounding variables bad?
A) They provide
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