Draw a three-dimensional representation of the data in Fig. 3-7A with the dummy variable that defines exposure to secondhand smoke (or lack thereof) as the third axis. What is the meaning of the slope...

Draw a three-dimensional representation of the data in Fig. 3-7A with the dummy variable that defines exposure to secondhand smoke (or lack thereof) as the third axis. What is the meaning of the slope of the regression plane in the dummy variable dimension?

Fig. 3-7A