YRBS, prevalence proportions. Table 18.7 is based on results from the Youth Risk Behavior Surveillance (YRBS) system. The number of adolescents who had been in a car or other vehicle when the driver had been drinking alcohol is cross tabulated according to racial/ethnic group classifications. Calculate prevalences proportions for each of the groups. Then, determine the margin of error for each proportion according to this formula:
where TABLe 18.7 Data for Exercises 18.1 and 18.8. Drove or rode in a car or other vehicle when driver was drinking alcohol within past 30 days by racial/ethnic group.

Source: Frequency counts are projections based on data in Tables 1 and 4 of Eaton, D. K., Kann, L., Kinchen, S., Ross, J., Hawkins, J., Harris, W. A., et al.

(2006). Youth risk behavior surveillance—United States, 2005. MMWR Surveillance Summaries, 55(5), 1–108. The actual survey used multistage sampling to collect data. Counts have been adjusted to emulate the design effect of the complex sample.