A poll reported a 36% approval rating for a politician with a margin of error of 1 percentage point.

1)

How many voters should be sampled for a 90% confidence interval? Round up to the nearest whole number.

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2)

How many voters should be sampled for a 95% confidence interval? Round up to the nearest whole number.

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3)

How many voters should be sampled for a 95% confidence interval if no previous estimate is given? Round up to the nearest whole number.

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