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Ramp metering is a trafc engineering idea that requires cars entering a freeway to stop for a certain period of time before joining the traffic ow. 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 ow 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 pm. with the ramp meters on and a second random sample of 15 cars on a different Monday at 6 pm. with the meters off resulted in the following speeds (in miles per hour). E Click the icon to view the data sets. (a) Draw side-byside boxplots of each data set. Does there appear to be a difference in the speeds? Are there any outliers? Choose the correct box plot below. o A. o B. o c. Q Q Q 0n or- or or 9' 0n- 9' 0n 9' reWW reWW 0 15 30 45 60 E 0 15 30 45 60 [3' 0 15 30 45 60 [3' MPH MPH MPH Does there appear to be a difference in the speeds? 0 Speed data (in MPH) - x O A. Yes, the Meters 0n data appear to have higher speeds. O B. No, the box plots do not show any difference in speeds. O (2. Yes, the Meters Off data appear to have higher speeds. Ramp Meters On Ramp Meters Off FU" Data Set '3. _ q 29 48 56 23 26 41 Are there any outliers. 37 31 25 33 38 30 42 45 51 48 39 1 8 34 54 41 28 24 40 42 26 48 38 52 42 Click to select your answer(s). Are there any outliers? O A. Yes, there appears to be a low outlier in the Meters On data. O B. Yes, there appears to be a high outlier in the Meters Off data. O C. No, there does not appear to be any outliers. O D. Yes, there appears to be a high outlier in the Meters On data. (b) Are the ramp meters effective in maintaining a higher speed on the freeway? Use the a = 0.05 level of significance. State the null and alternative hypotheses. Choose the correct answer below. O B. Ho:Hon * Hoff O A. Ho:Hon =Hoff H1:Hon > Hoff H1:Hon > Hoff O D. Ho:Hon Hoff H1: Hon * Hoff Determine the P-value for this test.Determine the P-value for this test. P-value = (Round to three decimal places as needed.) Choose the correct conclusion. O A. Do not reject Ho. There is not sufficient evidence at the a = 0.05 level of significance that the ramp meters are effective in maintaining higher speed on the freeway. O B. Reject Ho. There is not sufficient evidence at the a = 0.05 level of significance that the ramp meters are effective in maintaining higher speed on the freeway. O C. Do not reject Ho. There is sufficient evidence at the a = 0.05 level of significance that the ramp meters are effective in maintaining higher speed on the freeway. O D. Reject Ho. There is sufficient evidence at the a = 0.05 level of significance that the ramp meters are effective in maintaining higher speed on the freeway