1) For the data in exercise 9, page 556 do the following.
a) Fit the two-way ANOVA to this model using PROC GLM, checking the
assumptions, and stating which factors and/or interactions are significant.
Estimate the various parameters. Without looking at the original data,
how could you use the Type III SS to tell you it was unbalanced.
b) How would you code this two-way ANOVA problem as a dummy variable
regression? That
is, list the different dummy variables you would use, and say what values
would each of the 12 = (3x4) cells would take on them?
c) Address this problem as an ANCOVA, being sure to check the assumptions
(including that the slope for time is the same in each medium).
Is the effect of medium significant? Is the slope associated with time?
2) For the data in exercise 5, page 553, analyze the data both as a standard linear regression and as a logistic regression, being sure to check the assumptions and stating any conclusions you can make.