Answer Happy

(2) Returning to problem 1, suppose that the analyst wanted to
build a regression model by defining y = the change in
blood pressure, and coding the qualitative
factor drug using dummy variables to represent
A, B, and C.
(a) Following the approach shown in class, write down
a way of coding the qualitative factor drug so
that it can be added to the regression model. (8
pts)
(b) Write down a regression model using y as
your dependent variable and your coding in part (a) to add the
qualitative factor drug. What does this
model imply for drug A? Drug B? Drug
C? (5 pts)
(c) What hypotheses would you test to see
if drug impacts y = the change in blood
pressure? (5 pts)