The article "Genotype-Environment Interactions and Phenotypic Stability Analyses of Linseed in Ethiopia" (W. Adguna and M. Labuschagne, Plant Breeding, 2002:66-71) describes a study in which seed yields of 10 varieties of linseed were compared. Each variety was grown on six different plots. The yields, in kilograms per hectare, are presented in the following table.

a. Construct an ANOVA table. You may give ranges for the P-values.
b. Can you conclude that the varieties have differing mean yields?

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