Question: A simple random sample of 36 filtered cigarettes is obtained and the tar content of each cigarette is measured. The sample has a standard deviation

A simple random sample of 36 filtered cigarettes is obtained and the tar content of each cigarette is measured. The sample has a standard deviation of 3.2 mg. We want to test a claim that the tar content of filtered cigarettes has a standard deviation of less than 3.8 mg.

6. Find the test value 7. Find the critical value. 8. Draw a conclusion.

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