The Gallup U.S. Employment poll reported on March 15, 2011, a national unemployment rate of 10.4%. (Data

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The Gallup U.S. Employment poll reported on March 15, 2011, a national unemployment rate of 10.4%. (Data from www.gallup.com/poll/125639/Gallup_Daily_Workforce.aspx.)
a. Gallup claims that the margin of error of the poll is +/– 0.7 percentage points. Estimate approximately on how many responses the poll was based?
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