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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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