In the last section we talked about the regression line, and how it was the line that best represented the data in a scatterplot. In this section, we’re going to get technical about different measurements related to the regression line.
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To find RMSE, you’ll find the residual for each data point, then square it. You’ll add up all of those square residuals, and then divide by n-1, just like when we were taking sample standard deviation, instead of population standard deviation. Then you’ll take the square root of that result, and you’ll get the standard deviation of the residuals.
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A scatterplot, also called a scattergraph or scatter diagram, is a plot of the data points in a set. It plots data that takes two variables into account at the same time.
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