Larry Lesher ran this experiment in order to determine whether pushing a certain pedestrian light button had an effect on how long he had to wait before the pedestrian light showed walk. The treatment factor of interest was the number of pushes of the button, and 13 observations were taken for each of 0, 1, 2, and 3 pushes of the button. The waiting times for the walk sign for the first 32 observations in the order collected are shown in Table 3.12, giving r0 = 7, r1 = r2 = 10, r3 = 5

Estimate the contrast 0 (1 + 2 + 3)/3, which compares the effect of no pushes of the button with the average effect of pushing the button once, twice, or three times.

Table 2: Time in seconds for the 'walk' sign to appear Table 2: Time in seconds for the 'walk' sign to appear