Refer to Exercise 12. The treatments with a delivery ratio of 1:0 were controls, or blanks. It was discovered after the experiment that the high apparent levels of sorption in these controls was largely due to volatility of the trifluralin.
Eliminate the control treatments from the data.
a. Estimate all main effects and interactions.
b. Construct an ANOVA table. You may give ranges for the P-values.
c. Is the additive model plausible? Provide the value of the test statistic, its null distribution, and the P-value.
d. Construct an interaction plot. Explain how the plot illustrates the degree to which interactions are present.