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The daily yield for local chemical plant has averaged 880 metric tons for the last several years. The quality manager would like to know whether

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The daily yield for local chemical plant has averaged 880 metric tons for the last several years. The quality manager would like to know whether this average has changed in recent months. She selects a random sample of 50 days and gets a mean of 871 and a standard deviation of 21 metric tons. Test the appropriate hypothesis using a = 0.05. Use the pValue method

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