Question

True or False:

4) There is a potential of information bias in a clinical trial where the clinician who ascertains the outcome is aware of the treatment status of the participant being evaluated.
5) A confounding variable is a factor across which the association between the exposure and the outcome differ.
6) A cohort study was conducted to determine the association of physical activity and CHD in which the average age of the physically active group is 10 years younger than the average age of the inactive group. Age is a confounder given that the risk of CHD increases with age.
7) Systematic errors can be reduced by: minimizing the random error in the study and vice versa.

Answer 1

4. True

5. False (A confounding variable is a factor that is related to both the exposure and the outcome, and that may distort the association between them)

6.True

7.False (Systematic errors cannot be reduced by minimizing random error. Systematic errors are caused by flaws in the study design or execution, while random errors are due to chance.)