(Solved): 11) A traffic engineering study on traffic delay was conducted at intersections with signals on urb ...

11) A traffic engineering study on traffic delay was conducted at intersections with signals on urban streets. Three types of traffic signals were utilized in the study: (1) pretimed, (2) semi actuated, and (3) fully actuated. Five intersections were used for each type of signal. The measure of traffic delay used in the study was the average stopped time per vehicle at each of the intersections (seconds/vehicle). The data follow. SentCr. IF. Reilly, C. Gardner, and J. Kell (1976). A Technique for measurement of delay at intersections. Techwiral Rupert. FHW A-RD-76-135, Federal Highway Administration, Office of R \& D. Washington, D.C. a. Write the linear statistical model for this study and explain the model components. b. State the assumptions necessary for an analysis of variance of the data. c. Compute the analysis of variance for the data. d. Compute the least squares means of the traffic delay and their standard errors for cach signal type. e. Compute the \( 95 \% \) confidence interval estimates of the signal type means. f. Test the hypothesis of no difference among the mean traffic delay of the signal types with the F test at the . 05 level of significance.