Whirling Disease Is a Deadly Disease That Affects Trout in Montana

Whirling disease is a deadly disease that affects trout in Montana rivers. In a follow-up to a 2006 study conducted by the Montana Department of Fish, Wildlife and Parks (FWP) , researchers sought to determine if the proportion of trout afflicted by whirling disease in the Gallatin river differs between rainbow trout and brown trout. To test this theory, researchers collected a representative sample of 527 rainbow trout and 459 brown trout. Of the 527 rainbow trout collected, 120 had developed whirling disease; of the 459 brown trout collected, 74 had developed whirling disease.
-Based on the conditional proportions found in question 4, does it appear that whether a trout develops whirling disease is associated with the species of trout (rainbow or brown) ?

A) No, since there were approximately the same number of trout in each species.
B) Yes, since the number of trout who developed whirling disease differed from the number of trout who did not develop whirling disease.
C) Yes, since the conditional proportion of trout that developed the disease differed between rainbow and brown trout.
D) Yes, since the proportion of trout that developed the disease was not equal to 0.5.