Rules for means and variances it is quite easy to verify, Ask an Expert

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Rules for means and variances. It is quite easy to verify the formulas for the mean and standard deviation of the difference D.

(a) What are the means and standard deviations of the two sample proportions p^{^}₁ and p^{^}₂?

(b) Use the addition rule for means of random variables: what is the mean of D = p^{^}₁ - p^{^}₂?

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