Question

Caculated test

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 SanDiego County. A sample of 792 children treated for injuries sustained from motor vehicle accidents was obtained, and each child was classified according to (1) ethnicstatus (Hispanic or non-Hispanic) and (2) seat belt usage (worn or not worn) during the accident.

Referring to Table, the calculated test statistic is

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

a. -0.9991
b. -0.1368
c. 48.1849
d. 72.8063

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