Practice - Using PROC GLM to Perform Post Hoc Parwise Comparisons

TOTAL POINTS 2

1.

Question1

Consider the analysis of thegarlicdata set. In the previous exercise, you used PROC GLM to perform one-way ANOVA, and found that there was a statistically significant difference among mean garlic bulb weights for the different fertilizers. Now, perform a post hoc test to look at the individual differences among means.

1. Use PROC GLM to conduct pairwise comparisons with an experimentwise error rate of =0.05. (Use the Tukey adjustment.) Submit the code and view the results.
2. Which types of fertilizer are significantly different?

Question2

1. Use level 4 (the chemical fertilizer) as the control group and perform a Dunnett's comparison with the organic fertilizers to see whether they affected the average weights of garlic bulbs differently from the control fertilizer.
2. Which types of fertilizer are significantly different?