6. The following data represent the results from an independent-measures study comparing three treatments.
a. Compute SS for the set of 3 treatment means. (Use the three means as a set of n 3 scores and compute SS.)
b. Using the result from part a, compute n(SSmeans).
Note that this value is equal to SSbetween (see Equation 13.6).
c. Now, compute SSbetween with the computational formula using the T values (Equation 13.7). You should obtain the same result as in part b.
Treatment
I II III
n 10 n 10 n 10
M 2 M 3 M 7
T 20 T 30 T 70