=+ These counties were divided into two mutually independent groups, rural and nonrural, according to population size of less than 25,000 in 2000 or not. Random samples of nine rural and seven nonrural counties gave the following data on percentage population change: Rural Nonrural 1.1,-21.7,-16.3, -11.3,-10.4,-7.0,-2.0,1.9,6.2 --2.4, 9.9, 14.2, 18.4, 20.1, 23.1, 70.4 Use all of the methods of this chapter to test the null hypothesis of equal distributions. (Hint: Notice that m n here.)