In this video, I want to give you an example of what it means to fit data to a line. Instead of doing my traditional video using my little pen tablet, I'm going to do it straight on Excel so you could see how to do this for yourself if you have Excel or some other type of spreadsheet program. And we're not going to go into the math of it. I really just want you to get the conceptual understanding of what it means to fit data with line or to do a linear regression. So here, let's just read the problem. The following table shows the median California income. Remember, median is the middle California income from 1995 to 2002, as reported by the US Census Bureau.