Sort all the random numbers and rank them from 1-12.
One factor: anticoagulant; three level: A, B, C
The alternative hypothesis is that at least two of the group means are not the same.
The squared deviations are summed over all observations over all groups. Partitioning the sum of squares.
The results from the analysis of variance are typically displayed in an ANOVA table.
The ANOVA test lets us detect when at least two groups have different underlying means, but it does not let us state which of the groups have means that differ from each other. The usual practice is to perform the overall F test . If H0 is rejected, then specific groups are compared, as discussed in this section.