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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 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

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.1: Measures Of Center
Problem 4GP
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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 8412 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 92%? (Round your answer to two decimal places.) The value of z v 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 8412 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 92%? (Round your answer to two decimal places.) The value of z v should be changed to
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