Enteroliths are calcifications that form in the gut of a horse. The stones can cause considerable morbidity and mortality. A study was conducted to investigate factors (such as diet and environment) that may be related to the formation of enteroliths. The study contained 62 horses with enteroliths (cases) and 75 horses without (controls). The graph below contains side-by-side boxplots of the percent of alfalfa in the diet for cases and controls.
Based on the boxplot cases, the median amount of alfalfa in the diet of cases is:
A)the same as for controls.
B)half the amount as for controls.
C)twice the amount as for controls.
D)None of the answer options is correct.

Question

Enteroliths are calcifications that form in the gut of a horse. The stones can cause considerable morbidity and mortality. A study was conducted to investigate factors (such as diet and environment) that may be related to the formation of enteroliths. The study contained 62 horses with enteroliths (cases) and 75 horses without (controls). The graph below contains side-by-side boxplots of the percent of alfalfa in the diet for cases and controls. 
 Based on the boxplot cases, the median amount of alfalfa in the diet of cases is:
A)the same as for controls. 
B)half the amount as for controls. 
C)twice the amount as for controls. 
D)None of the answer options is correct.

Quizplus · Accepted Answer

The median percent of alfalfa in the diet for cases is approximately 50%, while for controls it is approximately 25%. Therefore, the median amount of alfalfa in the diet of cases is twice that of controls.

Enteroliths Are Calcifications That Form in the Gut of a Horse