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Observations are made on the time required to check out customers at a supermarket. From a...

Observations are made on the time required to check out customers at a supermarket. From a sample of 36, it takes aisle M an average of six minutes per customer with a standard deviation of three minutes. In the same sample of 36, it takes aisle J an average of eight minutes with a standard deviation of 5 minus. Is the difference in average ties due solely to chance, with a probability of .05 of picking samples with extreme values?

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