Question

Which of the following is the best method of ensuring that the experimental and control arms in a experiment study are
similar with regard to known and unknown confounders at the planning stage?
a) Matching
b) Randomization
c) Stratification
d) Multivariate analysis
​

Answer 1

Stratification

Hope it helps uh !!

Answer 2

$\huge \pink {answer}$

c. stratification