Reconsider the Izod impact test on PVC pipe described in Exercise 8-23. Suppose that you want to

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Reconsider the Izod impact test on PVC pipe described in Exercise 8-23. Suppose that you want to use the data from this experiment to support a claim that the mean impact strength exceeds the ASTM standard (foot-pounds per inch). Formulate and test the appropriate hypotheses using a = 0.05.
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