A researcher hypothesizes that electrical stimulation of the lateral habenula will result in a decrease in food intake (in this case, chocolate chips) in rats. Rats undergo stereotaxic surgery, and an electrode is implanted in the right lateral habenula. You have enough funding to perform 5 surgeries. Following a ten-day recovery period, rats (kept at 80 percent body weight) are tested for the number of chocolate chips consumed during a 10-minute period both with and without electrical stimulation. The control group (no stimulation) has 5 rats. The electrically stimulated group on average consumed 24.0 (+1.0) and control group consumed 25.5 (+ 1.0). Is the electrical stimulation effective to decrease food intake? State all assumptions you make