Margin of Error Calculator
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The Margin of Error Calculator to calculate the amount of random sampling error in a survey's results.

From WikiPedia, whe know that The margin of error is a statistic expressing the amount of random sampling error in a survey's results. The larger the margin of error, the less confidence one should have that the poll's reported results are close to the "true" figures; that is, the figures for the whole population. Margin of error occurs whenever a population is incompletely sampled.

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