Whirling Disease Is a Deadly Disease That Affects Trout in Montana

Multiple Choice

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 relative risk found in question 6, does it appear that whether a trout develops whirling disease is associated with the species of trout (rainbow or brown) ?

A) Yes, since the relative risk differs from zero.
B) Yes, since the relative risk differs from one.
C) No, since the relative risk differs from zero.
D) No, since the relative risk differs from one.