Understanding Basic Statistics 6th Edition by Charles Henry Brase,Corrinne Pellillo Brase

Exercise 61

Fishing: Barbless Hooks In a combined study of northern pike, cutthroat trout, rainbow trout, and lake trout, it was found that 26 out of 855 fish died when caught and released using barbless hooks on flies or lures All hooks were removed from the fish (Source: A National Symposium on Catch and Release Fishing. Humboldt State University Press).
(a) Let p represent the proportion of all pike and trout that die (i.e.. p is the mortality rate) when caught and released using barbless hooks Find a point estimate for p.
(b) Find a 99% confidence interval for p and give a brief explanation of the meaning of the interval.
(c) Check Requirements Is the normal approximation to the binomial justi­fied in this problem Explain.