A recent study of driving behavior suggests that self reported measures of high driving skills and low ratings of safety skills create a dangerous combination (Sümer, Özkan, & Lajunen, 2006). (Note: Those who rate themselves as highly skilled drivers are probably overly confident.) Drivers were classified as high or low in self-rated skill based on responses to a driverskill inventory, then classified as high or low in safety skill based on responses to a driver-aggression scale. An overall measure of driving risk was obtained by combining several variables such as number of accidents, tickets, tendency to speed, and tendency to pass other cars. The following data represent results similar to those obtained in the study. Use a two-factor ANOVA with α = .05 to evaluate the results.

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Self-Rated Driving Skill High Low M = 5 M = 8.5 %3D Low T = 68 | SS = 71 N = 32 T = 40 SS = 52 G = 160 EX² = 1151 %3D Driving Safety %3D M = 3.5 M = 3 High T= 24 T = 28 SS = 34 SS = 46