
Sst = ssw + ssb
Hi everyone,
I have this problem to solve. It's been a while since I tried to figured out how to do, but I am totally lost.
Here it is.
Prove SST= SSW+SST in oneway Anova (one factor).
Σ ( xi  x̄ )² = Σ (xi  x̄ + x̄ k  x̄ k ) ²
Hint: Σ [ ( xi  x̄ k ) + ( x̄ k  x̄ )]²
Where should I start? Should I try to compute Σ [ ( xi  x̄ k ) + ( x̄ k  x̄ )]² in order to come up with SST= Σ ( xi  x̄ )²
Seriously, I have no idea ...
Any help ? (Crying)

Re: Sst = ssw + ssb
Hey Kentsection.
What is SSW and SST again? (In terms of the symbols you are using? Also note that Var[X+Y] = Var[X] + Var[Y] if X and Y are independent quantities (random variables, samples, etc).