Suppose in an industrial experiment that an engineer is interested in how the mean absorption of moisture in concrete varies among 4 different concrete aggregates. The samples are exposed to moisture for 48 hours. It is decided that 5 samples are to be observed for each aggregate, requiring a total of 20 samples to be tested. The data are recorded in Table 1. Table 1 Absorption of Moisture in Concrete Aggregates No. of observation Aggregate 1 2 3 4 5 A1 580 508 583 633 517 A2 615 511 573 648 677 АЗ 449 517 438 415 555 А4 631 522 613 656 679 Test the hypothesis that the mean absorption of moisture does not depend on various types of cement aggregates at the 0.05 level of significance.

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