The proportion of individuals with a certain feature in Population 1 is p1 = 0.8 and the proportion of individuals with the same feature in Population 2 is p2 = 0.7. Sample of size n1 = 40 are chosen from Population 1 and samples of size 12 - 50 are chosen from Population 2. What is the standard deviation of the sampling distribution of the difference in proportions p= P2 0.004 O 0.0906 O 0.0082 O 0.0042