2.13 ANOVA in Multiple Groups

anova2 <- aov(bab9$bweight ~ bab9$matagegp)
summary(anova2)
##                Df    Sum Sq Mean Sq F value Pr(>F)
## bab9$matagegp   3     99258   33086    0.08   0.97
## Residuals     637 272620864  427976

Note that since there are four categories in matagegp, we get three degrees of freedom.

Exercise 9.6: From the results of this test: a) What is the null hypothesis being tested in the analysis of variance? b) What is the result of the test?