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?

a. State the null and alternate hypotheses.

b. Compute the test statistic.

c. State a conclusion. Use the α = 0.05 level of significance.

Transcribed Image Text:

Block 1 2 3 4 5 After 3 days 1341 1316 1352 1355 1327 After 6 days 1376 1373 1366 1384 1358