With the data of Exercise 1, estimate the total amount spent on medical care for the disease using the Horvitz-Thompson estimator, and estimate its variance.
Exercise 1 Using the network sample of Example 1, estimate the total amount spent on medical care for the disease investigated. The dollar amounts for the seven people linked to the three households listed in the example are y1 = 0, y2 = 3400, y3 = 5000, y4 = 6600, y5 = 0, y6 = 0, and y7 = 12,000. None of the people linked to the other 97 households in the sample required any medical treatment for the disease. Use the multiplicity estimator and give an estimate of its variance.