In a study of the eye disease retinitis pigmentosa (RP), 211 patients were classified into four groups according to the pattern of inheritance of their disease. Visual acuity (spherical refractive error, in diopters) was measured for each eye, and the two values were then averaged to give one observation per person. The accompanying table shows the number of persons in each group and the group mean refractive error.38 The ANOVA of the 211 observations yields SS(between) = 129.49 and SS(within) = 2,506.8. Construct the ANOVA table and carry out the F test at α = 0.05.

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Mean Number of refractive Group Autosomal dominant RP27 Autosomal recessive RP Sex-linked RP Isolate RP Total persons 20 18 146 211 error +0.07 -0.83 -3.30 0.84