In each of the following cases, indicate whether ANOVA model I or modell II is more appropriate and
state your reasons:
a. In a study of absenteeism at a plant, the treatments are the three 8-hour shifts.
b. In a study of employee productivity. the treatments are 10 production employees selected at random
from all production employees in a large company.
c. In a study of anticipated annual income at retirement. the treatments are the four types of retirement
plans available to employees.
d. In a study of tire wear in 18-wheel trucks, the treatments are four tire locations selected at random.