School property tax rates. An economist is interested in knowing whether property tax rates differ among three types of school districts—urban, suburban, and rural. A random sample of several districts of each type produced the data in the table below (rate is in mills, where 1 mill = $1/1,000). Do the data indicate a difference in the level of property taxes among the three types of school districts? Use a = .05. Urban Suburban Rural 4.3 5.9 5.1 5.2 6.7 4.8 6.2 7.6 3.9 5.6 4.9 6.2 3.8 5.2 4.2 5.8 6.8 4.3 4.7