# The compressive strength, in kilopascals, was measured for concrete blocks from five different batches of concrete, both

## Question:

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.

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