Researchers can take several steps to enhance internal validity: 1. Randomization: Randomly assigning participants to different groups helps to evenly distribute confounding variables, reducing their impact. 2. Blinding: Blinding participants and researchers to group assignments helps to minimize bias. 3. Matching: Matching participants on key characteristics can help control for confounding variables. 4. Statistical Control: Using statistical methods to adjust for confounding variables can also enhance internal validity.
