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Mason, Gunst, and Hess (2003) describe the following study. A traffic engineer designs a study to compare the total unused red-light times for five methods of traffic-light signaling (A, B, C, D, and E). The engineer randomly selects five intersections in a major city and five time periods spaced across the day. The following table contains the unused red-light time in minutes, with the letter in parentheses indicating the method of signaling.

a. Identify the design by name.

b. Write a model for this study, identifying all the terms in the model.

c. Describe how randomization could be conducted in this study.

d. Is there significant evidence of a difference in the mean unused red-light times for the five signaling methods? Use a  .05.

e. Group the five intersections on the basis of their mean unused red-light times.

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