7. In a completely randomized design, 7 experimental units were used for each of the three levels of the factor.

Source of Variation	Sum of Squares	Degrees of Freedom	Mean Square	F
Treatment
Error	432076.5
Total	675643.3

a. Complete the ANOVA table.

b. Find the critical value at the 0.05 level of significance from the F-table for testing whether the population means for the three levels of the factors are different.

c. Use the critical value approach and = 0.05 to test whether the population means for the three levels of the factors are the same.