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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 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 a. (a) Assuming this to be the case, if a sample of 49 modified bars resulted in a sample average yield point of 8438 Ib, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) ) Ib (b) How would you modify the interval in part (a) to obtain a confidence level of 94%? (Round your answer to two decimal places.) The value of z vv 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 a. (a) Assuming this to be the case, if a sample of 49 modified bars resulted in a sample average yield point of 8438 Ib, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) ) Ib (b) How would you modify the interval in part (a) to obtain a confidence level of 94%? (Round your answer to two decimal places.) The value of z vv should be changed to

A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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 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 8438 Ib, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) Ib (b) How would you modify the interval in part (a) to obtain a confidence level of 94%? (Round your answer to two decimal places.) The value of z 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 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 8438 Ib, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) Ib (b) How would you modify the interval in part (a) to obtain a confidence level of 94%? (Round your answer to two decimal places.) The value of z should be changed to
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