Question

Ramp metering is a traffic engineering idea that requires cars entering a freeway to stop for a certain period of time before joining the traffic flow. The theory is that ramp metering controls the number of cars on the freeway and the number of cars accessing the​ freeway, resulting in a freer flow of​ cars, which ultimately results in faster travel times. To test whether ramp metering is effective in reducing travel​ times, engineers conducted an experiment in which a section of freeway had ramp meters installed on the​ on-ramps. The response variable for the study was speed of the vehicles. A random sample of 15 cars on the highway for a Monday at 6 p.m. with the ramp meters on and a second random sample of 15 cars on a different Monday at 6 p.m. with the meters off resulted in the following speeds​ (in miles per​ hour).

Ramp_Meters_On   Ramp_Meters_Off
27   24
38   33
43   47
35   29
42   37
47   25
32   36
47   39
56   22
27   51
57   41
26   31
51   17
40   41
46   42

Determine the​ P-value for this test.

​P-value equals=.? ​(Round to three decimal places as​ needed.)

Answer 1