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OpenStudy (anonymous):
A certain survey conducted had a population proportion of at most 22% for people who agreed. What is the confidence level if 20% of the people sampled agreed, and the standard error of the proportion is ±1%?
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OpenStudy (mathmale):
As best I can determine, you're supposed to work backwards and find out what the level of confidence was. For a confidence interval for a population proportion, the formula is |dw:1399948042237:dw|
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