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Politics : View from the Center and Left -- Ignore unavailable to you. Want to Upgrade?

To: TimF who wrote (21047)	6/15/2006 10:52:14 AM
From: Alastair McIntosh	Read Replies (1) \| Respond to of 541861

Formula Three: This formula is used whenever you are asked to compute how large a sample will be needed. The unexpected thing here is that the size of the population does not matter! All that matters is how much error you can tolerate. Take the margin of error you can tolerate, e.g., 4%, and convert it to a proportion, e.g., .04. This is your "M". Then use the formula N = 1/(M*M). Just multiply M by itself (square it) and divide the result into 1 (also called taking the reciprocal). crab.rutgers.edu