3. In two common species of flowers, A and B, the proportions of flowers that are blue are pa and pi, respectively. Suppose that independent random samples of 50 species-A flowers and 100 species-B flowers are selected. Let Pa be the sample proportion of blue species-A flowers and p,, be the sample proportion of blue species-B flowers. What is the mean of the sampling distribution of pa - Pb? (MA) Pa - Pb Pr (B) (C) (D) (E) Pa - Pr Pa (1-Pa) 50 + Pa(1-Pa) 50 Pr(1-P) 100 + Pb(1-P) 100

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