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1. Margin of error. A corporate executive reports the re- sults of an employee satisfaction survey, stating that 52% of employees say they are either "satisfied" or "extremely satisfied" with their jobs, and then says "the margin of error is plus or minus 4%." Explain carefully what that means.

2. Margin of error. A market researcher estimates the per- centage of adults between the ages of 21 and 39 who will see their television ad is 15%, adding that he believes his estimate has a margin of error of about 3%. Explain what the margin of error means.

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