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A number of minor automobile accidents take place at many high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that the modification in the kind of light will reduce such accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were selected at random, and the lights at those intersections were modified. The numbers of minor accidents during the 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 conclude that the modification reduced the number of traffic accidents?

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  • Category:- Statistics and Probability
  • Reference No.:- M916835

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