A researcher is investigating the effects of a new medication on patients with a specific disease. What action should be taken to ensure the study's validity?
Q1. A researcher is investigating the effects of a new medication on patients with a specific disease. What action should be taken to ensure the study's validity?
Answer: Use a control group to compare the outcomes of patients receiving the medication to those who do not
Explanation: Is correct; option D may introduce other variables. USAT, HAT and MDCAT analytical sections repeat this pattern.