One method that can be used to avoid problems with confounding variables in observational studies is to
A) match similar subjects from each of the study groups for comparisons.
B) randomly assign subjects to study groups.
C) use very large samples.
D) use voluntary response sampling.

Question

Quizplus · Accepted Answer

Matching similar subjects from each of the study groups can help control for confounding variables by ensuring that the groups being compared are as similar as possible in terms of potentially influential factors. Randomly assigning subjects to study groups can also help control for confounding variables, but this option is typically not available in observational studies. Using very large samples can help increase the precision of the study results, but it will not directly address issues with confounding variables. Voluntary response sampling can introduce bias and is generally not recommended for observational studies.

One Method That Can Be Used to Avoid Problems with Confounding