A study was conducted to determine whether the use of seat belts in motor vehicles depends on the educational status of the parents. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) parents' educational status (College Degree or Non-College Degree) 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.
Non-College Degree College Degree
Seat belts not worn 31 148
Seat belts worn 283 330
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) Wilcoxon rank sum test for independent populations
d) Kruskal-Wallis rank test
