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11 5 points Strength of concrete The compressive strength in kilopascals was measured for concrete...

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11 5 points 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 After 6 days After 3 days 1 1376 1336 Batch 2 1370 1315 3 4 1366 1381 1353 1354 5 1351 1322 Construct a 99 9 confidence interval for the difference between the mean strengths of blocks cured three days and blocks cured six days Let d represent the strength of blocks cured six days minus the strength of blocks cured three days Use the TI 84 calculator

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