Concerned about graffiti, mayors of nine suburban communities instituted a citiz

Question

Concerned about graffiti, mayors of nine suburban communities instituted a citizen Community Watch program.

you don't have to solve (a) or (c)- i know how to do those. I just put it here in case you need that information. Please show all work for (b) or (d)  

a) Choose the appropriate hypotheses to see whether the number of graffiti incidents declined. Assume d is the mean difference in graffiti incidents after and before.

answer- H0: d 0 versus H1: d < 0.

b) Find the test statistic tcalc. (Round your answer to 3 decimal place.)

c)State the critical value tcrit for = .05. answer is -1.860

d) Find the p-value. (Round your answer to 4 decimal places.)

Concerned about graffiti, mayors of nine suburban communities instituted a citizen Community Watch program.

Explanation / Answer

Monthly Incidents After Monthly Incidents Before difference(d) 8 6 2 5 12 -7 3 10 -7 8 5 3 3 7 -4 5 12 -7 1 3 -2 0 11 -11 2 6 -4 mean -4.111 std deviaition 4.5399 sample size 9.0000 std error= std dev/(n)^(1/2) 1.5133 t stat= (d)/std error -2.7166 p value = 0.0132

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