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5 On the basis of extensive tests the yield point of a particular type of...

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5 On the basis of extensive tests the yield point of a particular type of mild steel reinforcing bar is known to be normally distributed with o 100 The composition of bars has been slightly modified but the modification is not believed to have affected either the normality or the value of o a Assuming this to be the case if a sample of 25 modified bars resulted in a sample average yield point of 8439 lb compute a 90 CI for the true aver age yield point of the modified bar b How would you modify the interval in part a to obtain a confidence level of 92 EEN SERE TREN 20 p POLIMER W jehuize F P BEHER WERDEN

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