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. Can you conclude that the mean strength after three days differs from the mean strength after six days? Let H represent the mean strength after three days and HH-H2. Use the a=0.01 level and the critical value method with the table. Block 1 2 3 4 5 After 3 days 1317 1363 1321 1333 1311 After 6 days 1382 1341 1327 1342 1386 Send data to Excel. Part 1 of 5 (a) State the null and alternate hypotheses. Ho: 0 H0 This hypothesis test is a two-tailed test. Part 2 of 5 Find the critical value. Round the answer to three decimal places. If there is more than one critical value, separate them with commas. 4.604 4.604 The critical value(s): Part: 2/5 Part 3 of 5 (b) Compute the test statistic. Round the answer to at least three decimal places. G