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.The number of children in each category is given in the table below. Referring to these data,which of the following conclusions should be reached if the appropriate hypothesis is conducted using an alpha = .05 level?
A)The mean value for Hispanics is the same as for Non-Hispanics.
B)There is no relationship between whether someone is Hispanic and whether they wear a seat belt.
C)The use of seat belts and whether a person is Hispanic or not is statistically related.
D)None of the above.

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.The number of children in each category is given in the table below.  Referring to these data,which of the following conclusions should be reached if the appropriate hypothesis is conducted using an alpha = .05 level?
A)The mean value for Hispanics is the same as for Non-Hispanics. 
B)There is no relationship between whether someone is Hispanic and whether they wear a seat belt. 
C)The use of seat belts and whether a person is Hispanic or not is statistically related. 
D)None of the above.

Quizplus · Accepted Answer

A hypothesis test with alpha = 0.05 would likely be a chi-square test of independence to examine the relationship between seat belt usage and ethnic status. If there is a significant relationship (p < 0.05), then we would conclude that the use of seat belts and ethnicity are statistically related. Therefore, option C is the correct choice. Option A is incorrect because we are not comparing means, and option B is incorrect because we are examining a relationship, not testing for a difference.

A Study Published in the American Journal of Public Health