Because the relationship between Breathalyzer-determined and selfreported blood alcohol levels in Problem 4.8 appeared to change above a certain level, we reanalyzed the data after throwing out the points at high levels (Problem 4.10). Another approach to this problem is to consider that the data define two different linear segments: one that describes the region of self-reported alcohol over a range of levels of 0–.11 (determined by examining a plot of the data) and the other over the range of values greater than .11. Using only one regression equation, fit these two line segments. (Hint: You will need to use a dummy variable in a new way.) What are the slopes and intercepts of these two segments?