A study was conducted on horses to identify factors that might contribute to the
ID: 3127754 • Letter: A
Question
A study was conducted on horses to identify factors that might contribute to the formation of enteroliths, stones that form in the colon of the horse and eventually lead to blockage and death. The table below summarizes disease status by sex (gelding, mare and stallion).
Disease Status
Sex
Case
Control
Total
Gelding
29
41
70
Mare
28
32
60
Stallion
5
2
7
Total
62
75
137
If you want to check whether there is an association between sex and case status, you should:
Disease Status
Sex
Case
Control
Total
Gelding
29
41
70
Mare
28
32
60
Stallion
5
2
7
Total
62
75
137
If you want to check whether there is an association between sex and case status, you should:
Explanation / Answer
As dependence is tested by comparing the conditional probabilities to the marginal probabilities, then
OPTION A: compare the conditional probabilities of being a case given sex. [ANSWER, A]
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