The following table gives the number of arrests made last year for violations of the narcotic drug laws in 24 communities. The data given are rates of arrest per 10,000 inhabitants.

Cities Cities Suburban Rural

(over 250,000) (under 250,000) Communities Communities 45 23 25 8 34 18 17 16 41 27 19 14 42 21 28 17 37 26 31 10 28 34 37 23 At   0.05, is there sufficient evidence to reject the hypothesis that the mean rates of arrests are the same in all four sizes of communities?

a. Solve using the p-value approach.

b. Solve using the classical approach.