Whirling Disease Is a Deadly Disease That Affects Trout in Montana

Short Answer

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.
-Identify the explanatory and response variables, and their types by filling in the blanks below:
The type of trout (rainbow or brown) is the ___(1)___ (explanatory/response) variable and it is ___(2)___ (categorical/quantitative).
Whether or not the trout developed whirling disease is the ___(3)___ (explanatory/response) variable and it is ___(4)___ (categorical/quantitative).