A group of tudent tried putting the cla hamter on a diet by feeding it the recommended erving ize on the package. The activity level of the hamter did not change and no one nuck it extra treat/food. After everal week, the hamter gained everal ounce, o the tudent decided to do further teting on food itelf. Which invetigation i mot likely to produce data that will help tudent anwer their quetion?
