A random sample of 21 AFC football players has a mean weight of 265 lb with a standard deviation of 30 lb, while a random

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A random sample of 21 AFC football players has a mean weight of 265 lb with a standard deviation of 30 lb, while a random sample of 11 NFC players has a mean weight of 240 lb with a standard deviation of 20 lb. Is the mean weight of all AFC football players greater than that for the NFC players at the 1% level of significance?

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