8.11 Barack Obama as president To answer these questions, refer to the data in a poll conducted...

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8.11 Barack Obama as president To answer these questions, refer to the data in a poll conducted by Gallup.com.

(Source: http://www.gallup.com/poll/113980/gallup-dailyobama-

job-approval.aspx)

a. Specify the population parameter, value of the sample statistic (using the chart based on a three-day rolling average for a selected three-day period), the point estimate, and the size of the margin of error.

b. Explain how to interpret the margin of error.

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