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Standard Deviation Actual Percentage Calculations

In a magazine article, the most recent approval rating of the president is reported. The parcentage of citizens who favor the president, despits his recent invlovement in a scandal, is 68% with a margin of error of +/-4%. What does this mean?

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This is because in this example, the average is 68%. If the margin of error is +/-4 ...

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Help with the margin of error is shown.