A developmental psychologist is examining the development of language skills from age 2 to age 4. Three different groups of children are obtained, one for each age, with n = 15 children in each group. Each child is given a language-skills assessment test. The data from this experiment were analyzed with an ANOVA, and the results are summarized in the following table. Fill in all of the missing values. (Hint: start with the df column using the formula sheet partIV.)

Source SS df MS or s2 F

Between treatments 30 ---- ---- ----

Within treatments ---- ---- ---- ----

Total 225 ---- ---- ----