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OpenStudy (anonymous):
A sample of 100 light bulbs is tested for failures. Of the 100 light bulbs, 10 of them don’t turn on. The population proportion is .15. Solve for the sample proportion and the standard deviation.
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OpenStudy (anonymous):
When the population size is much larger (at least 10 times larger) than the sample size, the standard deviation can be approximated by: S = sqrt[ P * ( 1 - P ) / n ]
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