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. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples size O d. NONE
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. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples size O d. NONE
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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Transcribed Image Text: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.
a. Sample size required at 95% confidence level is 154
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. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples size
O d. NONE
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