| Application to Polling |
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| l | Choose each
member with probability p |
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| l | Let X be total number of reds seen |
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| l | Then E[X]=pc |
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| l | So estimate ĉ by X/p |
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| l | Note ĉ accurate to within 1±e iff X is |
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| within 1±e of expectation: |
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| ĉ
= X/p Î (1±e) E[X]/p = (1±e) c |
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