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9. Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows:

9. Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are as follows:

MATLAB: An Introduction with Applications
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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9. Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are follows: After 6 days After 3 days Batch 1 2 3 4 1376 1373 1366 1384 1341 1316 1352 1355 5 1358 1327 a. Construct a 95% confidence interval for the difference between the mean strengths of blocks cured three days and blocks cured six days. b. A civil engineer claims that the mean strength of blocks cured three days is the same as that of blocks cured six days. Does the confidence interval contradict this claim?
Transcribed Image Text:9. Strength of concrete: The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both three and six days after pouring. The data are follows: After 6 days After 3 days Batch 1 2 3 4 1376 1373 1366 1384 1341 1316 1352 1355 5 1358 1327 a. Construct a 95% confidence interval for the difference between the mean strengths of blocks cured three days and blocks cured six days. b. A civil engineer claims that the mean strength of blocks cured three days is the same as that of blocks cured six days. Does the confidence interval contradict this claim?
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