For the example,

SSE

SSE

SSE

Therefore,

SSE = SSE

The sums of squares computed in this example are:

SST = 18

SSB = 8

SSE = 10.

Notice that SST = SSB + SSE. This is important because it shows that the total sum of squares can be divided into two components: the sum of squares due to treatments (SSB) and the sum of squares that not due to treatments (SSE).