Question

a researcher is setting up a randomized clinical trial to evaluate the effect of acetaminophen on liver function, and designates a control group of subjects and an experimental group of subjects. what could interfere with the results or completion of this study? - members of both groups engaging in strenuous exercise 3 - 5 days a week members of the experimental group failing to take acetaminophen according to the experimental regimen members of the control group being given a placebo (a mistake on the part of the researcher) members of the experimental group being given acetaminophen

Explanation:

1. Strenuous exercise can affect liver function, introducing a confounding variable.
2. If experimental - group members don't take acetaminophen as prescribed, it will distort the treatment effect.
3. Giving a placebo to the control group is a normal part of a randomized clinical trial and won't interfere.
4. Giving acetaminophen to the experimental group is as per the trial design and won't interfere.

Answer:

• members of both groups engaging in strenuous exercise 3 - 5 days a week
• members of the experimental group failing to take acetaminophen according to the experimental regimen