610 12 12-1 One-Way ANOVA 12-2 Two-Way ANOVA Are Larger Cars Safer in Crashes? ANALYSIS OF VARIANCE It is a common belief that larger cars are safer in crashes. Table 12-1 lists measurements of head injuries in car crash tests. These data are taken from Data Set 35 “Car Data” in Appendix B. Head injuries are the leading cause of death and disability in motor vehicle crashes. In car crash tests, head injuries are measured using HIC (“head injury criterion”), which is a measure of the likelihood of head injury arising from an impact. A higher HIC measure represents a higher probability of head injury in a crash. The data in Table 12-1 list HIC measures for a sample of different car models in four vehicle size categories: small, midsize, large, and SUV. Before jumping into the application of a particular statistical method, we should first explore the data. Sample statistics are included in the table on the next page. See also the boxplots of the four vehicle size categories of HIC measurements. CHAPTER PROBLEM
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