The zoologist wishes to test whether there is evidence that less than one-fourth of the sharks in the aquarium are diseased.
a. State the null and alternative hypotheses for this test.
b. What is the value of the statistic?

A zoologist at a large metropolitan zoo is concerned about a potential new disease present among the 243 sharks living in the large aquarium at the zoo. The zoologist takes a random sample of 15 sharks from the aquarium, temporarily removes the sharks from the tank, and tests them for the disease. He finds that 3 of the sharks have the disease.