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Gallup's standard of living measure reports the percentage of Americans who say their standard of living is getting better versus the percentage who say their standard of living is getting worse. Results are based on telephone interviews with approximately 3,000 national adults. The margin of error is reported as ±2 percentage points. In January of 2011, 49% reported that their standard of living is getting better.
-Provide an interval of numbers that is 95% certain to cover the true percentage of Americans who report that their standard of living is getting better.

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0.49 ± 0.0...

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