(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 place.)
tcalc =jQuery20003801681964427792_1525995999098 ?
(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 place.)
(d) Find the p-value. (Round your answer to 4 decimal place.)
(e) State your conclusion.
We (cannot/can) conclude that the number of graffiti incidents has decreased.?
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