# Statistics

Can someone help me do this problem?

A group of environmentalist are trying to estimate the population of the state rid in clear view park. They capture a sample of 500 birds in early spring and tag them. in august they capture 215 birds, of which 20 are tagged.
a) use the capture recapture method to find a central estimate of the population
b) estimate the population with a 95 percent confidence level
c)what objections can you raise to the way the capture recapture method was applied to estimate the population?

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1. a) Use ratio and proportion...

500 tagged birds/n total birds = 20/215

by cross products:
20n = 500 * 215
20n = 107,500
n = 107,500 / 20 = 5,375

b) ?

c) In early spring the recently hatched baby birds are probably not available for capture, as they are still in the nest. However, by August they would be available for the recapture. Therefore, the first capture data is not very sound, as the total population was underrepresented in the capture process.

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