U = {1,2,3,4,5,6,7,8} values of Yi are
i 1 2 3 4 5 6 7 8
yi 1 2 4 4 7 7 7 8
Consider the following samping scheme
S = (1,3,5,6), P(S) = 1/8
S = (2,3,7,8), P(S) = 1/4
S = (1,4,6,8), P(S) = 1/8
S = (2,4,6,8), P(S) = 3/8
S = (4,5,7,8), P(S) = 1/8
Find the probability of selection pi for each unit i and what is the sampling distribution of t hat = 8*ybar.