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Are Americans getting fatter? Researchers interested in this question take a random sample of 500 people and record an average weight of 190 pounds and

Are Americans getting fatter? Researchers interested in this question take a random sample of 500 people and record an average weight of 190 pounds and a standard deviation of 25 pounds. Ten years ago, the mean weight was 185 pounds.

What are the null and alternative hypotheses?

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