Question

A fisherman is interested in n, the number of fish in a certain pond. He catches 100 fish, tags them, and throws them back. A few days later, he returns and catches 80 fish, of which 18 are tagged. Find an approximate 90% condence interval for n by inverting the acceptance region of a level .10 pearson's chi-square test for independence between the binary variables in first day's catch and in second day's catch

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