Traffic Engineers Compared Rates of Traffic Collisions at Intersections with Raised

question 43

Multiple Choice

Traffic engineers compared rates of traffic collisions at intersections with raised medians and rates at intersections with two-way left-turn lanes. They found that out of 4,653 collisions at intersections With raised medians, 2,289 were rear-end collisions, and out of 4,606 collisions at two-way left-turn Lanes, 2,027 were rear-end collisions.
Assuming these to be random samples of collisions from the two types of intersections, construct a 95% Confidence interval for the difference between the proportions of collisions that are of the rear-end Type at the two types of intersection.

• A) (0.032, 0.072)
• B) (0.042, 0.061)
• C) (0.472, 0.512)
• D) (0.492, 0.440)

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