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 presented in the following table. Batch 3 1352 4 1341 1376 5 1327 1358 1316 1355 After 3 days After 6 days 1373 1366 1384 Can you conclude that the mean strength after six days is greater than the mean strength after three days?

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