Solved: On the basis of extensive tests, the yield point of a particulartype of mild
Chapter 7, Problem 6(choose chapter or problem)
On the basis of extensive tests, the yield point of a particulartype of mild steel-reinforcing bar is known to be normallydistributed with . The composition of bars has beenslightly modified, but the modification is not believed tohave affected either the normality or the value of s.a. Assuming this to be the case, if a sample of 25 modifiedbars resulted in a sample average yield point of 8439 lb,compute a 90% CI for the true average yield point of themodified bar.b. How would you modify the interval in part (a) to obtain aconfidence level of 92%?
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