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

Question

A 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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