The internal validity of a study can be increased by using which of the following to create different research groups?

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Randomization is the process of assigning participants to different groups randomly, which reduces the risk of systematic bias in the study. This helps to increase internal validity by ensuring that any differences between the groups are due to the manipulation of the independent variable and not to pre-existing differences between the participants. Valid measures and generalizable methods are important for ensuring the accuracy and generalizability of the study findings, but they do not directly address internal validity. The personal characteristics of potential participants should not be used to create different research groups as it can result in systematic bias.

The Internal Validity of a Study Can Be Increased by Using