Table 9: Two way analysis of variance for compressive strength of concrete.

Source of Variation SS df MS F P-value F crit
Curing Days 5557.319 4 1389.33 305.1365 3.93E-39 2.525215
CS Addition 377.0152 5 75.40305 16.56066 3.03E-10 2.36827
Interaction 166.0313 20 8.301564 1.823261 0.038434 1.747984
Within 273.1885 60 4.553141 - - -
Total 6373.554 89 - - - -