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We want to poll people in Oregon to determine what proportion have received at least one Covid-19 vaccine. The national rate is reported to be

We want to poll people in Oregon to determine what proportion have received at least one Covid-19 vaccine. The national rate is reported to be 77%, which we use as a guide in choosing our sample size. What size sample should we take so that the margin of error in a 96% confidence interval is less than 3%?

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