<s>[INST] A researcher is interested in studying the effect of a new supplement on muscle growth. They recruit 100 participants and assign them to either a treatment group or a control group. The treatment group receives the new supplement, while the control group receives a placebo. After 12 weeks, the researcher measures the muscle mass of each participant and finds that the average muscle mass in the treatment group is 10 kg higher than in the control group. However, when examining the data more closely, the researcher notices that the standard deviation of muscle mass in the treatment group is 5 kg, while the standard deviation in the control group is 3 kg.[/INST]