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

a. *H*_{1}: *μ*_{d} ≤ 0 versus *H*_{0}: *μ*_{d} > 0.

b. *H*_{0}: *μ*_{d} ≥ 0 versus *H*_{1}: *μ*_{d} < 0.

**(b) **Find the test statistic *t*_{calc}. **(A negative amount should be indicated by a minus sign. Round your answer to 2 decimal place.)**

*t*_{calc =jQuery20003801681964427792_1525995999098 ? }

**(c) **State the critical value *t*_{crit} for α = .05. **(A negative amount should be indicated by a minus sign. Round your answer to 3 decimal place.)**

*t*_{crit =?? }

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

*p*-value =??

**(e) **State your conclusion.

We (cannot/can) conclude that the number of graffiti incidents has decreased.?

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