In an experiment, a scientist decides to study the effect of exercise on cholesterol levels in people. He studies to set up people-those who exercise everyday for an hour and those who don't exercise at all. In this case, the statement that people who exercise for an hour may have lower cholesterol levels is: A. a hypothesis
B. a law
C. an observation

to test the statement, the scientist would measure cholesterol levels in exercisers and non-exercisers. The cholesterol levels would be:

A. a dependant variable
B. an independent variable
C. qualitative data