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To compare the average amount of time that Canadians and Americans spend commuting, a researcher collects a sample ofCanadians andAmericans. The Canadians spend an average

To compare the average amount of time that Canadians and Americans spend commuting, a researcher collects a sample ofCanadians andAmericans. The Canadians spend an average ofhours a week commuting, with a standard deviationhours. The mean and standard deviation for the sample of Americans ishours andhours, respectively. The standard error of the difference of sample means is

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