9. A physician wants to assess the potential causes of high cholesterol among her patients to tailor self-care instructions. She has collected data on total cholesterol, BMI, physical activity, age, gender, alcohol consumption, and stress. Use the Chapter09.xls fi le under the Problem 09–09 tab. Which variables have a statistically signifi cant relationship with total cholesterol? If BMI can be reduced by two points, what is the expected impact on total cholesterol?