In a completely randomized design, 12 experimental units were used for the first treatment, 15 for the second treatment, and 20 for the third treatment. Complete the following analysis of variance. At a .05 level of significance, is there a significant difference between the treatments?
Source of Variation Sum of Squares Degrees of Freedom Mean Square F p-value
Treatments 1200 ? ? ?
Error ? ? ? ?
Total 1800