Next section: Introduction to tests supplementing ANOVA

SST = 3²+5²+3²+5²+2²+2²+4²+4²+2²+1²+3²+2² - CF

= 126-108 = 18

The sum of squares between (SSB) can be calculated as:

where is the total of the scores in group 1 squared, is the total of the scores in group 2 squared, etc. n

SSB = 256/4 + 144/4 + 64/4 - 108 = 8

Since SST = SSB + SSE,

SSE = SST - SSB = 18 - 8 = 10

With equal sample sizes, the formula for SSB can be simplified somewhat:

which in this case is:

Next section: Introduction to tests supplementing ANOVA