Exercise 11.8.2. Box (1950) presents data on the weight loss of a fabric due to abrasion. Two fillers were used in three proportions. Some of the fabric was given a surface treatment. Weight loss was recorded after 1000, 2000, and 3000 revolutions of a machine designed to test abrasion resistance. The data are given in Table 11.1.

Perform a multivariate analysis of variance, a profile analysis, and fit a simple linear growth curve model. Check your assumptions.