An industrial engineer is analyzing the structural strength of a concrete aggregate. Structural strengthis normally distributed with o² = 1000 (psi)². A random sample of 12 specimens has a mean strengthof x = 3250 psi. Compare the width of the 95% confidence interval with the width of 99% confidenceinterval. Which has higher precision of estimation on the unknown µ? Include your solutions.O a. 95% confidence interval is wider than the 99% interval. It has a higher precision of estimating the population meanO b. NONEO c. 3232 < u < 3268 and 3226 < µ < 3274O d.95% confidence interval is narrower than the 99% interval. It has a higher precision of estimating the population mean

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Answered: An industrial engineer is analyzing 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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Both, the Cohen's d and confidence interval, measure the impact of the IV on the DV. The only difference is that the confidence interval does so for the population, whereas the Cohen's d does so for the sample.
An industrial engineer is analyzing the structural strength of a concrete aggregate. Structural strength is normally distributed with o? = 1000 (psi)?. What sample size is required if it is desired to estimate the structural strength with an error that is less than 10 psi at 95% confidence? level Would the sample size increase or decrease if the confidence level becomes 90%? Include your solutions. O a. Sample size required at 95% confidence level is 154 O b. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% will increase the samples size for the error to be less than 10 psi O c. NONE O d. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples size
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