Question 1
True or False.
If when using the model

we determine that interaction between
x1 and
x2 is not significant, we can drop the
x1x2 term from the model and use the simpler model

◦ True
◦ False
Question 2
True or False.
One advantage to writing a single model that includes all levels of a qualitative variable rather a separate model for each level is that we obtain a pooled estimate of
σ2.
◦ True
◦ False