Dr Jones Systematically Varies the Brightness in the Laboratory (400

question 5

Multiple Choice

Dr. Jones systematically varies the brightness in the laboratory (400, 800, and 1600 lumens) while holding other variables constant, and observes that the participants' activity level decreases as the brightness decreases. This illustrates ____.

• A) a noncausal relationship between brightness and activity level
• B) a causal relationship between brightness and activity level
• C) no relationship between brightness and activity level
• D) a nonsystematic relationship between brightness and activity level

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