MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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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?
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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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Step 1: a. Preliminary calculations:
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Step 2: Sample mean and sample standard deviation of difference:
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Step 3: 95% confidence interval:
VIEW
Step 4: b. Hypotheses:
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