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A number of minor automobile accidents occur at various high-risk intersections in York county despite the...

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Basic Math

A number of minor automobile accidents occur at varioushigh-risk intersections in York county despite the traffic lights.The traffic department claims that a modification in the type oflight will reduce these accidents. The county commissioners haveagreed to a proposed experiment. Eight intersections were chosen atrandom, and lights at those intersections were modified. The numberof minor accidents during a six-months periods before and after themodifications were

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, it is reasonable to conclude thatthe modifications reduced the number of traffic accidents?

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