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(a) Assuming this to be the case, if a sample of 81 modified bars resulted in a sample average yield point of 8471 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 96% ? (Round your answer to two decimal places.)

(a) Assuming this to be the case, if a sample of 81 modified bars resulted in a sample average yield point of 8471 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 96% ? (Round your answer to two decimal places.)

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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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 = 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 81 modified bars resulted in a sample average yield point of 8471 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) lb (b) How would you modify the interval in part (a) to obtain a confidence level of 96%? (Round your answer to two decimal places.) ---Select--- should be changed to
Transcribed Image Text: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 = 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 81 modified bars resulted in a sample average yield point of 8471 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) lb (b) How would you modify the interval in part (a) to obtain a confidence level of 96%? (Round your answer to two decimal places.) ---Select--- should be changed to
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