Math Solutions

[See] In a Harris Interactive survey of 1006 adults, 86% say that they wash their hands after using a public restroom; the margin of error is 3 percentage

Question: In a Harris Interactive survey of 1006 adults, 86% say that they wash their hands after using a public restroom; the margin of error is 3 percentage points. USA Today reported that among 6028 adults observed in restrooms, 85% washed their hands; the margin of error is 1 percentage point. Use the given statistics and margin of error to identify the confidence interval for each study. Which study do you believe, and why?

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