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What would the confidence interval for the true percentage of adults be in this problem?

Use the given degree of confidence and sample data to construct a confidence interval for the population proportion.

Of 140 adults selected randomly from a town, 35 of them smoke. Construct a 99% confidence interval for the true percentage of all adults in the town that smoke.

I keep getting a negative answer for the lower limit so I don’t think I am doing it correctly.

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