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A health survey determined the mean weight of a sample of762 men between the ages of26and31 to be173 pounds, while the mean weight of a

A health survey determined the mean weight of a sample of762 men between the ages of26and31 to be173 pounds, while the mean weight of a sample of1,561 men between the ages of67 and72 was162 pounds. The difference between the mean weights is significant at the0.05 level. Determine the meaning of this significance level.

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