In a one-way layout, seven observations are taken from treatment I and their sum is 327.8, eight observations are taken from treatment 2 and their sum is 381.3, seven observations are taken from treatment 3 and their sum is 337.0, and six observations are taken from treatment 4 and their sum is 292.9. The ANOVA table gives a p-value of exactly 1%.
(a) Write out the complete ANOVA table.
(b) Calculate pairwise confidence intervals for the treatment means with an overall confidence level of 95%, and make a graphical representation of what you find.