Let population size N = 6 and sample sizen = 3, and suppose the element values in the population are the following: yi = 98, y2 = 102, y3 = 154, y4 133, y5 = 190, y6 = 175 (a) Under systematic sampling, list all possible samples and compute the variance of sample mean. (b) What is T13, the joint inclusion probability of the first and third elements?

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