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240 County residents were randomly selected and asked about their opinion of a proposed water conservation policy. 87 of the residents were in favor of

240 County residents were randomly selected and asked about their opinion of a proposed water conservation policy. 87 of the residents were in favor of the policy.

What is the sample proportion?

Construct a 90% confidence interval for the proportion of county residents in favor of the proposed water conservation policy

How large of sample should be taken in order to estimate the proportion to within 2% with a 90% confidence?

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