An article gave the following summary information for fracture strengths (MPa) of n - 196 ceramic bars fired in a particular kiln: x- 28.23, s - 3.16. (a) Calculate a (two-sided) confidence interval for true average fracture strength using a confidence level of 95%. (Round your answers to two decimal places.) ) MPa Does it appear that true average fracture strength has been precisely estimated? O Yes, this is a very narrow interval. O No, this is a very wide interval. (b) Suppose the investigators had believed a priori that the population standard deviation was about 6 MPa. Based on this supposition, how large a sample would have been required to estimate u to within 0.5 MPa with 95% confidence? ceramic bars

An article gave the following summary information for fracture strengths (MPa) of n - 196 ceramic bars fired in a particular kiln: x- 28.23, s - 3.16. (a) Calculate a (two-sided) confidence interval for true average fracture strength using a confidence level of 95%. (Round your answers to two decimal places.) ) MPa Does it appear that true average fracture strength has been precisely estimated? O Yes, this is a very narrow interval. O No, this is a very wide interval. (b) Suppose the investigators had believed a priori that the population standard deviation was about 6 MPa. Based on this supposition, how large a sample would have been required to estimate u to within 0.5 MPa with 95% confidence? ceramic bars

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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