In experiments, subjects are picked for each group through ______, which simply means that each subject has an equal chance of being placed in either group.

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Random assignment ensures that the groups are comparable and that any differences observed between the groups can confidently be attributed to the experimental manipulation rather than preexisting differences between the groups. Hypotheses are proposed explanations for a phenomenon, control groups are used for comparison to the experimental group, scientific method is the process of conducting scientific research, and surveys are a method of data collection.

In Experiments, Subjects Are Picked for Each Group Through ______