Election_Samples.png


Summary

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English: Number of cases and reliability in samples used for election audits. Some samples are specified as at least 1% (or 3%, 5%) of precincts or voting machines, rounded up to the next whole number of precincts or machines. The sample would typically be hand-counted to find errors made in earlier counts. Other samples are specified as the sample size needed to ensure at least 95% (or 50%) odds that the hand counts will reach one or more precincts where an error is present, given an assumption that 5% of precincts (rounded to the nearest precinct) have errors, such as a bug, or a hack which was trying to pass unnoticed to sway a close election. The graph uses 1 minus the hypergeometric distribution for the odds of missing the erroneous precincts. If more or fewer precincts actually have errors, then odds of finding them are larger or smaller, respectively.
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5 April 2018