If you have calculated an equation for a straight line least squares fit, convert it to the form y = mc + c and m is the slope.
If you have "eyeballed" and drawn the line, measure it's projection onto the x and y axes and divide the y value by the x value (it's called "rise over run" or rise/run and can be expressed as (y2-y1)/(x2 -x1) )
If you have "eyeballed" and drawn the line, measure it's projection onto the x and y axes and divide the y value by the x value (it's called "rise over run" or rise/run and can be expressed as (y2-y1)/(x2 -x1) )
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Use the linear regression formula to compute the slope and intercept, given all the points.
The regression formula is the formal way to describe the line that goes through the points of the scatter plot as "centrally" as possible.
The regression formula is the formal way to describe the line that goes through the points of the scatter plot as "centrally" as possible.