Income and road rage. The phenomenon of road rage has received much media attention in recent years. Is a driver’s propensity to engage in road rage related to his or her income? Researchers at Mississippi State University attempted to answer this question by conducting a survey of a representative sample of over 1,000 U.S. adult drivers. (Accident Analysis and Prevention, Vol. 34, 2002.) Based on how often each driver engaged in certain road rage behaviors (e.g., making obscene gestures at, tailgating, and thinking about physically hurting another driver), a road rage score was assigned. (Higher scores indicate a greater pattern of road rage behavior.) The drivers were also grouped by annual income: under $30,000, between $30,000 and $60,000, and over $60,000. The data were subjected to an analysis of variance, with the results summarized in the next table. Interpret the results fully. Is a driver’s propensity to engage in road rage related to his or her income?
Income Group | Sample Size | Mean Road Rage Score |
Under $30,000 | 379 | 4.60 |
$30,000 to $60,000 | 392 | 5.08 |
Over $60,000 | 267 | 5.15 |
ANOVA results: | F-value = 3.90 | p-value <.01 |
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