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 the bar 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 49 modified bars resulted in a sample average yield point of 8412 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) (b) How would you modify the interval in part (a) to obtain a confidence level of 92%? (Round your answer to two decimal places.) The value of z v should be changed to
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 the bar 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 49 modified bars resulted in a sample average yield point of 8412 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) (b) How would you modify the interval in part (a) to obtain a confidence level of 92%? (Round your answer to two decimal places.) The value of z v should be changed to
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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