State three key elements of control in an experiment that allow researchers to draw cause-and-effect conclusions.
What will be an ideal response?
Ans: Randomization (random sampling and random assignment), manipulation (of variables that operate in an experiment), and comparison/control (a control group)
Learning Objective: 7-4: Describe three elements of control required in an experiment.
Cognitive Domain: Knowledge
Answer Location: General Elements and Structure of Experiments
Difficulty Level: Easy
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