The most common procedure to try to ensure that experimental and control groups do not differ from each other in important ways at the beginning of a research study is random assignment of subjects to treatment and control groups.

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Random assignment is the most common method used to ensure that the experimental and control groups are equal at the beginning of a study. It involves randomly assigning participants to either the treatment or control group, which helps to minimize systematic biases that can affect the validity of the results.

The Most Common Procedure to Try to Ensure That Experimental