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Yes, you can time the market! - Official website for the progressive rock band YES


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The margin of error is the amount of error that you can tolerate. If 90% of respondents answer yes , while 10% answer no , you may be able to tolerate a larger amount of error than if the respondents are split 50-50 or 45-55.

The confidence level is the amount of uncertainty you can tolerate. Suppose that you have 20 yes-no questions in your survey. With a confidence level of 95%, you would expect that for one of the questions (1 in 20), the percentage of people who answer yes would be more than the margin of error away from the true answer. The true answer is the percentage you would get if you exhaustively interviewed everyone.

How many people are there to choose your random sample from? The sample size doesn't change much for populations larger than 20,000.




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