Dr. Clinton measures children's intelligence ahead of time and then assigns an equal number of high- and low-scoring children to each treatment condition. Dr. Clinton is using

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Dr. Clinton is using matching by assigning an equal number of high- and low-scoring children to each treatment condition based on their initial intelligence scores. This technique allows for better control of potential confounding variables and helps to create more equivalent groups for comparison. Random assignment (D) would involve assigning participants to treatment conditions without considering their initial intelligence scores, which could lead to unequal groups and reduced internal validity. A natural, or quasi-, experiment (C) involves observing existing differences between groups without manipulating an independent variable, which is not the case here. A confounding variable (A) is a variable that is related to both the independent and dependent variables and can affect the results, but it is not mentioned in this scenario.

Dr Clinton Measures Children's Intelligence Ahead of Time and Then