I need help with problem B and thank you

Homework: 5-2 MyStatLab: Module Five Problem Set Save core: 0.75 of 5 pts 12 of 14 (11 complete) HW Score: 51.69%, 33.6 of 65 pts 11.3.13-T : Question Help 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) Click the icon to view the data sets. (b) Are the ramp moters effective in maintaining a higher speed on the freeway? Use the a =0.01 level of significance. State the null and attemative hypotheses Choose the correct answer below. i Speed data (in MPH) O A. HD Hon Hon C B. Ho-Mon Hott Why-Hon Holt Hy Pon >Hort O C. Ho Pon = Huff O D. Holton Hott Ramp Meters On Ramp Meters Off Ful 1 14 Hon >Von 27 49 55 23 25 42 38 31 75 34 37 30 Click to select your answer and then click Check Answer. 44 47 49 46 38 18 2 parts 36 56 40 30 22 41 remaining Clear All 12 25 46 38 52 41