Drove when drinking alcohol. Table 18.7 presented cross-tabulated results for the number of adolescents who drove or rode in a car or other vehicle when the driver was drinking alcohol. Prevalence proportions varied from 11.3% (non-Hispanic white) to 4.9% (nonHispanic black). Test the data in Table 18.7 for significance by calculating its chi-square statistic, df, and P-value.