In a study of processes used to remove impurities from cellulose goods (“Optimization of...

In a study of processes used to remove impurities from cellulose goods (“Optimization of Rope-Range Bleaching of Cellulosic Fabrics,” Textile Research J., 1976: 493–496), the following data resulted from a 2⁴ experiment involving the desizing process. The four factors were enzyme concentration (A), pH (B), temperature (C), and time (D).

a. Use Yates’s algorithm to obtain sums of squares and the ANOVA table.

b. Do there appear to be any second-, third-, or fourth-order interaction effects present? Explain your reasoning. Which main effects appear to be significant?