In Greece, an agricultural experiment designed to assess differences in yields of olives for four different varieties (Athenolia, Black olives, Green olives, and Koroneiki), using six different fertilizers, produced the results (in kilos per acre) shown in the following table:

a. Prepare the two-way analysis of variance table.
b. Test the null hypothesis that the population mean yields are identical for all four varieties of corn.
c. Test the null hypothesis that population mean yields are the same for all three brands of fertilizer.

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Fertilizer 1 2 3 4 45 5 6 Athenolia 23 22 17 23 19 22 Black 22 22 21 20 22 20 Green 21 24 20 24 21 22 Koroneiki 22 27 28 28 23 29