Source of variation Sum of squares d.f. Mean square F-ratio F-tab X1 0.00187500 1 0.00187500 0.42 F1,17=1.45 X2 0.00020833 1 0.00020833 0.05 X12 0.20423045 1 0.20423045 46.19 X22 0.08965974 1 0.08965974 20.28 F4,17=2.96 F14.3=8.71 Model 0.29597352 4 0.0739934 16.7335 Error 0.0751719 17 0.00442188     Lack of fit 0.05171 14 0.004083 0.6805   Purely experimental uncertainty 0.01800 3 0.00600     Total (corr) 0.44086 21       R2 0.7974

Table 8: Analysis of variance for variables and for the full regression for resolution factor (Rs).