Question 2 1 point possible(graded) The variance of the average treatment effect is given by 2 5'2 5'2 Vol: =&+_*si Nc N N i What does the term F represent? t O The average of the variance ofK; in the treatment group and in the control group O The variance of the mean of the outcomes K in the treatment group O The average outcomes K; in the treatment group O The standard deviation of the outcomes K; in the treatment group