TABLE 11-8
A study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles in San Diego County depends on ethnic status. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) ethnic status (Hispanic or non-Hispanic) and (2) seat belt usage (worn or not worn) during the accident. The number of children in each category is given in the table below.

-Referring to Table 11-8, which test would be used to properly analyze the data in this experiment?
A) χ² test for independence
B) χ² test for differences among more than two proportions
C) χ² test for variance
D) none of the above

Question

TABLE 11-8
A study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles in San Diego County depends on ethnic status. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) ethnic status (Hispanic or non-Hispanic) and (2) seat belt usage (worn or not worn) during the accident. The number of children in each category is given in the table below.
 
-Referring to Table 11-8, which test would be used to properly analyze the data in this experiment?
A) χ² test for independence 
B) χ² test for differences among more than two proportions 
C) χ² test for variance 
D) none of the above

Quizplus · Accepted Answer

The data in this experiment involves two categorical variables (ethnic status and seat belt usage) and we want to determine if there is a relationship between them, so we would use the χ² test for independence. Option B is not applicable as we only have two proportion categories. Option C is not applicable as we are not testing for differences in variance. Option D is not applicable as we need to use a statistical test to analyze the data.

TABLE 11-8 A Study Published in the American Journal of Public Health