Four kinds of fertilizer f1, f2, f3, and f4 are used to study the yield of beans. The soil is divided into 3 blocks each containing 4 homogeneous plots. The yields in kilograms per plot and the corresponding treatments are as follows:(a) Conduct an analysis of variance at the 0.05 level of significance using the randomized complete block model.(b) Use single-degree-of-freedom contrasts and a 0.01 level of significance to compare the fertilizers (f1, f3) versus (f2, f4) and /1 versus f3. Drawconclusions.

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Block 2 f3 = 50.9 fi = 50.0 f2 = 38.0 f4 = 40.2 Block 3 Block 1 fi = 42.7 f3 = 48.5 f4 = 32.8 f2 = 39.3 f4 = 51.1 2 = 46.3 Si = 51.9 fa = 53.5 %3D %3D