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Test for mean numbers of accidents before and after modifications  

A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the sort of light will reduce these accidents. The county commissioners have agreed to a planned experiment. Eight intersections were chosen at random, and the lights at those intersections were modified. The numbers of minor accidents during a six-month period before and after the modifications were:

 

Â

Number of Accidents

A

B

C

D

E

F

G

H

Before modification

5

7

6

4

8

9

8

10

After modification

3

7

7

0

4

6

8

2

At the .01 significance level is it reasonable to finish that the modification reduced the number of traffic accidents?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M918179

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