A student performs an experiment to measure weight gain in mice that eat rodent chows varying in protein and fat content. The positive control in this experiment is standard rodent chow with 25% protein and 5% fat contents . The negative control is given water only (no food). For this experiment, a net change in weight of 0.5 grams or higher is considered a weight gain or loss. If the weight of a mouse fluctuates less than 0.5 grams up or down, it is considered healthy weight maintenance . The table shows the results , including those of the two control mice