study published in the American Journal of Public Health was conducted to determ

Question

study published in the American Journal of Public Health was conducted to determine whether the use of seat belts in motor vehicles depends on ethnic status in San Diego County. 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.

Referring to Table, which test would be used to properly analyze the data in this experiment?

HISPANIC NON-HISPANIC
SEAT BELTS WORN 31 148
SEAT BELTS NOT WORN 283 330

A. chi-square test for independence
B. chi-square test for differences between two proportions (independent samples)
C. chi-square test for differences between two proportions (related samples)
D. chi-square test for differences among more than two proportions

Explanation / Answer

Answer: A. chi-square test for independence

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