ORIGINAL QUESTION. I am finding the correlation coefficient and the linear regression line (equation) using the STAT feature on my calculator. I noticed that when MathXL walks you through this problem, you have the option to choose if the line is a good fit, is not a good fit, or is horizontal. According to the book, it states a correlation coefficient value close to 1 or -1 is a good fit and a correlation coefficient value close to 0 is a bad fit. What correlation coefficient would make this line horizontal? I asked my teacher, but she responded with..verbatim... "I don't know...I'll ask around." Anybody have an idea? I find it weird considering I've never seen the horizontal option before, granted..I'm not mapping the line either. The problem itself is cake, I just don't understand this horizontal option.