Determining the critical value of F. For each of the following situations, state how large the F statistic needs to be for rejection of the null hypothesis at the 0.05 level.
(a) Compare 3 groups with 5 observations per group.
(b) Compare 4 groups with 4 observations per group.
(c) Compare 4 groups with 8 observations per group.
(d) Summarize what you have learned about F distributions from this exercise.