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A grocery store sells apples in bags that are claimed to have a mean weight of 3 lbs. The Department of Weights and Measures tests

A grocery store sells apples in bags that are claimed to have a mean weight of 3 lbs. The Department of Weights and Measures tests 100 randomly selected bags and finds a mean weight of 2.8 lbs.

The sample statistic is

The population parameter is

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