Equation of the regression line
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This topic contains 1 reply, has 3 voices, and was last updated by Chris Clarke 7 years ago.

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25 April, 2012 at 12:00 #1403
Given the equation of the regression line it says you can not use the equation of the line to find the value of y.How do we find y?
25 April, 2012 at 12:10 #1410Where does it say this? I’m slightly confused by the question.
I assume that you have been given the line of regression of the form y = A + Bx.
The line is a mathematically calculated ‘line of best fit’ designed to minimise how far the different data points are away from it, on average. It is therefore not guaranteed to go through any of the data points. It does however go through the xmean and ymean coordinate point.
25 April, 2012 at 20:19 #1416In one of assignments we’ve determined the equation of the regression line,then we were given the y value and asked to calculate the x value then on our notes ‘we are not to use the equation ‘i need a clarity why?
7 May, 2012 at 16:02 #1503
AnonymousHi Ntyatyi
If the question says do not use the equation then the only other option is to read the value off from the graph. Usually we are allowed to use the equation.
Barrie 
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