Based on the data of the concrete test, a production company carries out tests on a new accelerator admixture for concrete with which it is intended to stabilize the resistance of the 250 kg / cm2 concretes developed with the three types of cement: pozzolanic I, pozzolanic II, pozzolanic III. Conduct a statistical hypothesis analysis based on ANOVA of two factors with multiple samples at 95% to determine whether or not there is a difference in the concrete strength.

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A: Given:

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