A simple random sample of normal subjects between the ages of 6 and 18 yielded the data on total body potassium (mEq) and total body water (liters) shown in the following table. Let total potassium be the dependent variable and use dummy variable coding to quantify the qualitative variable. Analyze the data using regression techniques. Explain the results. Plot the original data and the fitted regression equations.

Total Body Total Body Total Body Total Body Potassium Water Sex Potassium Water Sex 795 13 M 950 12 F 1590 16 F 2400 26 M 1250 15 M 1600 24 F 1680 21 M 2400 30 M 800 10 F 1695 26 F 2100 26 M 1510 21 F 1700 15 F 2000 27 F 1260 16 M 3200 33 M 1370 18 F 1050 14 F 1000 11 F 2600 31 M 1100 14 M 3000 37 M 1500 20 F 1900 25 F 1450 19 M 2200 30 F 1100 14 M