It means i need help can u tell me what It means
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The mean is 8.
if there is just one line in each window then that means the test came out negative
Let's say that you fit a simple regression line y = mx + b to a set of (x,y) data points. In a typical research situation the regression line will not touch all of the points; it might not touch any of them. The vertical difference between the y-co-ordinate of one of the data points and the y value of the regression line for the x-co-ordinate of that data point is called a residual.There will be one residual for each data point.To see some labelled diagrams of residuals search images.google.com for residuals.
They all describe data set or data sets,hey tell you how far apart they are from each other.