Draw individual value plots or side-by-side boxplots of the square-root transformed responses in the six factor-level groups.
a. Is there any extreme skewness or outliers that would cause us to question the normality assumption?
b. Without doing any statistical calculations, do you expect to reject the three null hypotheses for the paper towel study? Justify your answer by visually comparing the variation (i. e., the spread) in the strength between groups to the variation within groups.