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: Batch 1 2 3 4 5 After 6 days After 3 days 1376 1370 1366 1381 1351 1336 1315 1353 1354 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.