In an experiment comparing two diets, subjects are randomly assigned to diet A or diet B.
What is the primary purpose of random assignment?
- A
To eliminate the need for a control group
- B
To ensure the sample is representative of the population
- C
To reduce nonresponse bias
- Dcheck_circle
To create groups that are roughly balanced on potential confounding variables
Explanation
Random assignment balances both known and unknown variables across treatment groups, allowing causal interpretation of differences in outcomes.