Dr. Gillespie conducts an experiment on childhood aggression. She has two groups in her experiment. She places participants into each group by flipping a coin. Heads places them in group A; tails places them in group B. In this experiment, Dr. Gillespie has satisfied the requirement of

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Random assignment is the process of assigning participants to different groups in an experiment randomly. In this scenario, the researcher uses a coin flip, which meets the requirement of random assignment. The other options are not applicable in this situation; experimental control refers to the manipulation of an independent variable to observe its effect on a dependent variable, while a placebo control involves administering a placebo treatment to a control group. Blind experimentation refers to concealing information from participants or researchers to minimize bias.

Dr Gillespie Conducts an Experiment on Childhood Aggression