Which of these is not true about randomization in a clinical trial?
Reduces confounding
Decreases selection bias
Ensures comparability of two groups
Increases external validity of the trial
Ans: D. Increases external validity of the trial(Ref Park 24/e p87, 23/e p82, 22/e p79)External validity is the validity of generalized (causal) inferences in scientific research, usually based on experiments as experimental validity.In other words, it is the extent to which the results of a study can be generalized to other situations and to other people.This cannot be ensured by randomization.