A process that produces bottles of shampoo, when operating correctly, produces bottles whose contents weigh on average 20 ounces. A random sample of eight bottles for a single production run yielded the following content weights (in ounces): 21.4 19.7 20.6 19.7 20.8 20.1 20.3 20.9 Test at the 5% level of significance if the process is operating correctly.

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A process that produces bottles of shampoo, when operating correctly, produces bottles whose contents weigh on average 20 ounces. A random sample of eight bottles for a single production run yielded the following content weights (in ounces): 21.4 19.7 20.6 19.7 20.8 20.1 20.3 20.9 Test at the 5% level of significance if the process is operating correctly.

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