• Dr. Smith wants to examine whether a new drug increases the maze running
performance of older rats. Just like aging humans, older rats show signs of poorer
memory for new things. Dr. Smith teaches two groups of older rats to find a
of tasty rat chow in the maze. One group of rats is given the new drug while they
are learning the maze. The second group is not given the drug. One week after
having learned the maze he retests the rats and records how long it takes them to
find the rat chow.
Independent Variable:
Dependent Variable: