A researcher wished to compare SBP across three groups. She used SPSS One-Way ANOVA to produce the output below. Descriptives SBP N Mean Std. Deviation Std. Error None 496 136.51 20.082 .902 Possible 137 138.28 21.353 1.824 Definite 96 142.30 22.214 2.267 Total 729 137.61 20.678 .766 SBP ANOVA Sum of Squares df Mean Square F Sig. Between Groups 2770.196 2 Within Groups 308519.601 726 1385.098 424.958 3.259 .039 Total 311289.797 728 She then decided to fit the following linear model SBP = + 1 [if group=none] + 2 [if group=possible] + 3 [if group=definite] + error where 3=0 and Var (error) = What would be her estimate of 2 ?