TABLE 12-8
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 12-8, at 5% level of significance, the critical value of the test statistic is
A) 3.8415.
B) 5.9914.
C) 9.4877.
D) 13.2767.

Question

TABLE 12-8
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 12-8, at 5% level of significance, the critical value of the test statistic is
A) 3.8415. 
B) 5.9914. 
C) 9.4877. 
D) 13.2767.

Quizplus · Accepted Answer

At a 5% level of significance, the critical value for a chi-square test with 1 degree of freedom is 3.8415.

TABLE 12-8 A Study Published in the American Journal of Public Health