You want to see if the new drug treatment shrinks the size of tumors in mice. You treat 70 mice with drug A, 7 with drug B and 7 with a placebo. You measure the outcome as the amount of tumor shrinkage in millimeters after one week.

1.What are the variable(s) in the study? (include units)

2.What is the level of measurement of the variable(s)? (Nominal, Ordinal, Continuous)

3.If there are groups are they related in any way?

4. What statistical test is most appropriate to use in analyzing the data given the information provided