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 ofo.Assuming this to be the case, if a sample of 49 modified bars resulted in a sample average yield point of 8420 Ib, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.)IbHow would you modify the interval in part (a) to obtain a confidence level of 98%? (Round your answer to two decimal places.)--Select--v should be changed to

Givenσ=100sample size(n)=49Mean(x¯)=8420confidence interval =90%

Answered: On the basis of extensive tests, the…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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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 0. (a) Assuming this to be the case, if a sample of 25 modified bars resulted in a sample average yield point of 8435 lb, compute a 90% CI for the true average yield point of the modified bar. (Round your answers to one decimal place.) 8383.60 X 8486.40 1x ) Ib
When samples of size 30 are collected from a normal population that has a mean of 200 and a standard deviation of 40, the standard deviation of the sampling distribution is?
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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 36 modified bars resulted in a sample average yield point of 8448 lb, 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 96%? (Round your answer to two decimal places.) V ---Select--- should be changed to The sample size The standard deviation You may nee The sample mean e in the Appendix of Tables to answer this question. The value of z Need Help
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