Question: The Concrete file contains data that represent the compressive strength, in thousands of pounds per square inch (psi), of 40 samples of concrete taken two

The Concrete file contains data that represent the compressive strength, in thousands of pounds per square inch (psi), of 40 samples of concrete taken two and seven days after pouring.

At the 0.01 level of significance, is there evidence that the mean strength is lower at two days than at seven days?

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