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A city council commissioned a statistician to estimate the proportion p of voters in favor of a proposal to build a new library. The statistician obtained a random sample of 200 voters, with 112 indicating approval of the proposal.
(a) What is a point estimate for p?
(b) Find a 90% confidence interval for p.
(c) What is the maximum error of estimate for p?
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Determine a 95 % confidence interval for the iron concentration.
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