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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 Ob.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 OC. NONE O d. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples size

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 Ob.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 OC. NONE O d. Sample size required at 95% confidence level is 39. Reducing the confidence level to 90% decreases the required samples size

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.3: Measures Of Spread
Problem 1GP
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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
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. 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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