In Exercises 17.11.3, 17.11.4, and 18.7.1, we considered data from Cornell

(1988) on scaled vinyl thicknesses. Exercise 17.11.3 involved five blends of vinyl and we discussed the fact that the production process was set up eight times with a group of five blends run on each setting. The eight production settings were those in Exercise 17.11.4. The complete data are displayed in Table 19.19.

(a) Identify the design for this experiment and give an appropriate model. List all the assumptions made in the model.

(b) Analyze the data. Give an appropriate analysis of variance table. Examine appropriate contrasts using the LSD method with an α of .05.

(c) Check the assumptions of the model and adjust the analysis appropriately.

(d) Discuss the relationship between the current analysis and those conducted earlier.