The file statepop.dat, used in Example 6.5, also contains information on total number of farms, number of

Question:

The file statepop.dat, used in Example 6.5, also contains information on total number of farms, number of veterans, and other items.
a. Plot the total number of farms versus the probabilities of selection ψi. Does your plot indicate that unequal-probability sampling will be helpful here?
b. Estimate the total number of farms in the United States, along with its standard error.