# aov 함수 형식: aov(종속 변수~그룹 변수, data=데이터프레임 이름)
>>> aov.out = aov(count~spray, data=InsectSprays)
>>> summary(aov.out)
            Df   Sum Sq  Mean Sq   F value   Pr(>F)
spray        5     2669    533.8      34.7   <2e-16 ***
Residuals   66     1015     15.4
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Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1