Three different varieties of tomatoes (Hunester (H), Pusa (P) and Ife No. 1 (If1)) and four different planting densities (10, 20, 30 and 40 thousand plants per hectare) are being considered for planting in certain region. To see if variety or plant density affects product, each combination of variety and density is used in three different plots, resulting in the production data below. (? = 0.01)

Variedad Densidad Plantacion 10,000 20,000 30,000 40,000 H 10.5, 9.2, 7.9 12.8, 11.2, 13.3 12.1, 12.6, 14.0 10.8, 9.1, 12.5 If1 8.1, 8.6, 10.1 12.7, 13.7, 11.5 14.4, 15.4, 13.7 11.3, 12.5, 14.5 P 16.1, 15.3, 17.5 16.6, 19.2, 18.5 20.8, 18.0, 21.0 18.4, 18.9, 17.3