Compute the two groups using paired sample t-test

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Reference no: EM1316487

Compare the two groups using Paired sample t-test.

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 type of light will reduce these accidents. The county commissioners have agreed to a proposed experiment. Eight intersections were chosen at random, and the lights at those intersections were modified. The number of minor accidents during a six-month period before and after modification was:

	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

These samples are "paired" (really just one sample, two observations, right?)

Required:

At the .01 significance level is it reasonable to conclude that the modification reduced the number of traffic accidents? Show all steps.

Reference no: EM1316487

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