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Margin of Error and Confidence
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GMAT
DI.089 Margin of Error and Confidence
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A 95% confidence interval for mean score increase after training is 0.8 to 1.6 points. Which conclusion is supported?
A
Every participant improved by at least 0.8 point.
B
The population mean score increase is positive at the stated confidence level.
C
The training lowered the population mean score.
D
The interval gives no information because it does not include 0.
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