Aspirin tablets are sold with the label “active ingredient: aspirin 325 mg.” It is also known that the standard deviation is 25 mg. An investigator wants to test whether this claim is true. They draw a random sample of 100 tablets and the average content of aspirin was found to be 320 mg. Test whether the average amount of aspirin is different from 325 mg at a 5% level of significance.

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Aspirin tablets are sold with the label “active ingredient: aspirin 325 mg.” It is also known that the standard deviation is 25 mg. An investigator wants to test whether this claim is true. They draw a random sample of 100 tablets and the average content of aspirin was found to be 320 mg.

Test whether the average amount of aspirin is different from 325 mg at a 5% level of significance.

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