An industrial engineer is analyzing the structural strength of a concrete aggregate. Structural strengthis normally distributed with o? = 1000 (psi)². What sample size is required if it is desired to estimatethe structural strength with an error that is less than 10 psi at 95% confidence? level Would thesample size increase or decrease if the confidence level becomes 90%? Include your solutions.O a. NONEO b. Sample size required at 95% confidence level is 154Oc. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples sizeO d. 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

here , variance = 1000 (psi)2 here z- critical for 95% confidence level is 1.96 because…

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Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section: Chapter Questions

Problem 22SGR

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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.