Using the iris data in R ... a) Does species explain a significant amount of the variation in sepal length? Give your decision where you either reject or do not reject the null, as well as the p-value on which that decision was based. I'll give you 5 bonus points if you can report the exact omnibus p-value and show how you calculated it based on information from the summary() object. b) Interpret the ANOVA model that you fit in a). c) Create the corresponding one-way ANOVA table. d) Examine the four diagnostic plots for your ANOVA linear model. How do they look? How many high-leverage iris specimens are there?