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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Definitions:

Policies

Guidelines or rules established by organizations to govern their operations, behaviors, and decisions.

Dependent Variable

In statistical modeling and experiments, it is the variable being tested and measured, usually thought to depend on one or more independent variables.

Target Variable

In data analysis and modeling, the specific outcome or response that the model is designed to predict.

Causal Variable

A variable that is presumed to cause or determine the outcome of interest in a research study.