Past exam of the mathematics course of the University of Cambridge / 2018 / iii / Paper 207 / 2 / b / Solution

The difference of the Bernoulli distribution variances factors asThe first factor is positive, whereas $p_0>1-p_1$ makes the second negative. Thus $v_0<v_1$ and $R^{\ast }=\sqrt{v_0/v_1}<1$. Therefore Neyman allocation assigns more patients to treatment 1, the inferior treatment. Minimizing the variance of a treatment comparison and maximizing the number of desirable responses are different objectives.