Concerned about graffiti, mayors of nine suburban communities instituted a citizen Community Watch program. Community Monthly Incidents After Monthly Incidents Before Burr Oak 8 12 Elgin Corners 3 6 Elm Grove 7 8 Greenburg 0 1 Huntley 4 2 North Lyman 0 4 South Lyman 4 4 Pin Oak 4 3 Victorville 0 3 (a) Choose the appropriate hypotheses to see whether the number of graffiti incidents declined. Assume μd is the mean difference in graffiti incidents before and after. a. H1: μd ≤ 0. versus H0: μd > 0 b. H0: μd ≥ 0 versus H1: μd < 0 (b) Find the test statistic tcalc. (A negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) tcalc (c) State the critical value tcrit for α = .05. (A negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.) tcrit (d) Find the p-value. (Round your answer to 4 decimal places.) p-value