The given data summarizes disease status by sex: gelding, mare, and stallion.
has enteroliths? yes. no. total
Gelding Yes:29 No:41 Total:70
Mare Yes:28 No:32 Total:60
Stallion Yes:5 No:2 Total:7
Total Yes:62 No:75 complete total:137
a. Calculate the marginal distribution for sex and the marginal distribution for disease status.
b. Calculate the conditional distributions of sex given disease status.
c. Calculate the conditional distributions of disease status given sex.
d. Plot by hand the conditional distribution of disease status given sex.
e. What can you say about the relationship between disease status and sex from your answer in d?
f. Calculate the relative risk of enteroliths for mares versus stallions. Interpret.
g. Calculate the odds ratio of enteroliths for mares versus stallions. Interpret.
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