A team of experts claims that a modification in the type of light will reduce these accidents. The lights at the chosen intersections in New York were modified. The number of accidents before and...

A team of experts claims that a modification in the type of light will reduce these accidents. The lights at the chosen intersections in New York were modified. The number of accidents before and after the modification has been recorded.

1. State the null hypothesis if traffic department wants to test whether the modification reduces the number of traffic accidents in New York


2. Continue from part a, state the corresponding alternative hypothesis of the test


3. Continue from part a, calculate the test statistics of the test


4. Continue from part c, what is the critical value of the test if the significant level is 1%?


5. According to the test, is it reasonable to conclude that the modification reduced the number of traffic accidents?