Use the population in Exercise 2 of Chapter 4 for this exercise. Let i be proportional to

Use the population in Exercise 2 of Chapter 4 for this exercise. Let ψi be proportional to xi.
a. Using the draw-by-draw method illustrated in Example 6.8, calculate πi for each unit and πij for each pair of units, for a without-replacement sample of size two.
b. What is V (ṫHT)? How does it compare with the with-replacement variance using (6.46)?

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