Question: A Gallup poll taken during June 2011 estimated that 8.8% of U.S. adults were unemployed. The poll was based on the responses of 30,000 U.S.

A Gallup poll taken during June 2011 estimated that 8.8% of U.S. adults were unemployed.
The poll was based on the responses of 30,000 U.S. adults in the workforce. Gallup reported that the margin of error associated with the poll is ±0.3 percentage points. Explain how they got this result. (www.gallup.com/poll/125639/Gallup-Daily-Workforce.aspx.)

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