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 Can you conclude that the mean strength after three days differs from the mean strength after six days? Let /z represent the mean strength after three days and /d = 01 ~ 4z' Use the & = 0.05 level. Block After } days 1354 After 6 doys 1341 131 1338 1330 1320 1307 1327 1371 1351 State the null and alternate hypotheses. Compute the test statistic: State a conclusion