The accompanying table gives summary data on cube compressive strength (N/mm2) for concrete specimens made with a pulverized fuel-ash mix. Age Sample Mean (days) 7 28 Sample Size 65 74 26.97 34.75 Sample SD 4.85 6.43 Calculate a 99% CI for the difference between true average 7-day strength and true average 28-day strength. (Use Ho: M-428 = 0. Round your answers to two decimal places.) ) N/mm² Interpret your 99% CI. O With 99% confidence, we can say that the true difference falls between these values. O With 99% confidence, that the true difference falls outside these values. With 99% confidence, that the true difference falls below the lower bound. O With 99% confidence, that the true difference falls above the upper bound.
The accompanying table gives summary data on cube compressive strength (N/mm2) for concrete specimens made with a pulverized fuel-ash mix. Age Sample Mean (days) 7 28 Sample Size 65 74 26.97 34.75 Sample SD 4.85 6.43 Calculate a 99% CI for the difference between true average 7-day strength and true average 28-day strength. (Use Ho: M-428 = 0. Round your answers to two decimal places.) ) N/mm² Interpret your 99% CI. O With 99% confidence, we can say that the true difference falls between these values. O With 99% confidence, that the true difference falls outside these values. With 99% confidence, that the true difference falls below the lower bound. O With 99% confidence, that the true difference falls above the upper bound.
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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