An Izod impact test was performed on 20 specimens of PVC pipe. The sample mean is  and the sample standard deviation is s = 0.29. Find a 99% lower confidence bound on the true Izod impact strength. Assume the data are normally distributed.

Round your answer to 3 decimal places.

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  A semiconductor manufacturer produces controllers used in automobile engine applications. The customer required that the process fallout or fraction defective at a critical manufacturing step not exceed 0.05 and that the manufacturer demonstrate process capacity at this level of quality using α = 0.05. The semiconductor manufacturer takes a random sample of 200 devices and finds that four of them are defective. Can tha manufaturer demonstrate process capability for the customer?

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