The data file agstrat.dat also contains information on other variables. For each of the following quantities, plot the data, and estimate the population mean for that variable along with its standard error and a 95% CI. Compare your answers with those from the SRS in Exercise 15 of Chapter 2.
a. Number of acres devoted to farms, 1987
b. Number of farms, 1992
c. Number of farms with 1000 acres or more, 1992
d. Number of farms with 9 acres or fewer, 1992