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2. Improving driving performance while fatigued. Long haul truck drivers are often asked to drive while fatigued. Can a secondary task – such as a word association task – improve the performance of the fatigued driver? This was the question of interested in a study published in the journal Human Factors in May, 2014. The researchers used a driving simulator to obtain their data. Each of 40 college students was assigned to drive a long distance in the simulator. However, the student-drivers were divided into four groups of 10 drivers each. Group 1 performed a verbal task continuously (continuous condition); Group 2 performed the task only at the end of the drive (late verbal condition); Group 3 did not perform the task at all (no verbal condition); Group 4 listened to a program on the car radio (radio show condition). At the end of the simulated drive, student-drivers were asked to recall billboards that they saw along the way. The percentage of billboards recalled by each student-driver is provided in the table below. Using the information on the table, answer the following questions. CONTINUOUS VERBAL LATE VERBAL NO VERBAL RADIO SHOW Ti 14 63 10 29 37 60 43 4 36 47 57 64 66 18 95 52 58 92 85 47 64 83 54 59 60 39 56 73 78 73 37 45 87 62 14 46 59 45 45 50 a. Determine if the mean recall percentage differs for student-drivers in the four groups. 41. = 343, 42. = 634, 93. = 639, 44. = 490, Ei=1 [j-1 yı; = 129992. =1

b. Investigate the researchers claim – Can a secondary task improve the performance of the fatigued driver – by comparing Group 1 to Group 3 and Group 3 to Group 4, what do you conclude? c. Estimate the overall mean and group effects.