In the following table are the cardiac output (L/min) and oxygen consumption (VO ) values for a sample of adults (A) and children (C), who participated in a study designed to investigate the relationship among these variables. Measurements were taken both at rest and during exercise. Treat cardiac output as the dependent variable and use dummy variable coding and analyze the data by regression techniques. Explain the results. Plot the original data and the fitted regression equations.

Cardiac Cardiac Output (L/min) VO2 (L/min) Age Group Output (L/min) VO2 (L/min) Age Group 4.0 .21 A 4.0 .25 C 7.5 .91 C 6.1 .22 A 3.0 .22 C 6.2 .61 C 8.9 .60 A 4.9 .45 C 5.1 .59 C 14.0 1.55 A 5.8 .50 A 12.9 1.11 A 9.1 .99 A 11.3 1.45 A 3.5 .23 C 5.7 .50 C 7.2 .51 A 15.0 1.61 A 5.1 .48 C 7.1 .83 C 6.0 .74 C 8.0 .61 A 5.7 .70 C 8.1 .82 A 14.2 1.60 A 9.0 1.15 C 4.1 .30 C 6.1 .39 A