3.13 ANOVA in Multiple Groups

anova2 <- bab9 %$% aov(bweight ~ matagegp)
summary(anova2)
##              Df    Sum Sq Mean Sq F value Pr(>F)
## 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:

    1. What is the null hypothesis being tested in the analysis of variance?
    1. What is the result of the test?