all 11 question

11 The data le counties.dat contains information on land area, population, number of physicians, unemployment, and a number of other quantities for an SRS of l of the 3l4l counties in the United States (U.S. Census Bureau, 1994). The total land area for the United States is 3,536,2T8 square miles; 1993 population was estimated to be 255,0?T.536. a Draw a histogram of the number of physicians for the 100 counties. ll Estimate the total number of physicians in the United States, along with its stan dard error, using My. l5\" Chapter 4: Ratio and Regression Estimation t: Plot the number of physicians vs. population for each county. Which method do you think is more appropriate for these data: ratio estimation or regression estimation? d Using the method you chose in (c), use the auxiliary variable population to estimate the total number of physicians in the United States, along with the standard error. e The \"true" value for total number of physicians in the population is 532,638. Which method of estimation came closer