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in this video we're going to focus on linear regression using the least squares method and this approach will help us to write a linear equation that best fits the data in the table shown below so let me give you a visual illustration so let's say we have these data points which i'm going to highlight in blue now these data points don't all fall on a straight line however what we can do is we can calculate the equation of a line that best fits this data where all of the points are as close to as possible to that line now what we're going to do is we're going to use a method called the least squares method to find the equation of the line and then once we have it we're going to test that equation to see how accurate it is in giving us the y values when we input the x values and then we're going to confirm our answer using excel so let's begin so the first thing we're going to do is we're