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obesity is defined as a body mass index of 30kg/m2 or more. A 95% confidence interval for the percentage of U.S. adults aged 20 years and over who were obesity was found to be 22.4 to 23.5%. What was the sample size????

Can you please show your work?? Thanks

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I think you need to provide the correct formulae for this one. I would link to some useful info, but this site doesn't allow linking.
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