Take the variable Car as a fixed effect. Do different additives have significantly different effect on boosting gas mileage?   Analysis of Variance Table   Response: mpg              Df Sum Sq Mean Sq F value    Pr(>F)    additive      2 31.262  15.631 23.3038 1.318e-06 *** car              2 65.152  32.576 48.5670 1.137e-09 *** additive:car  4 18.467   4.617  6.8829  0.000591 *** Residuals    27 18.110   0.671

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