Q1) Number of minor automobile accidents happens at different high-risk intersections in Teton Country despite traffic lights. Traffic Department claims that modification in type of light will decrease these accidents. Country commissioners have agreed to proposed experiment. Eight intersections were selected at random, and lights at those intersections were altered. Numbers of minor accidents during six-month period before and after modifications 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
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0
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4
|
6
|
8
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2
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At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?