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    (Original post by ChristopherHuey)
    Attached is the y calc approximations.

    Can anyone help me with a comment on their accuracy, as per the question?
    A couple of suggestions. You could work out the error (ycalc- y) for each point and see if the errors are greater or smaller for particular ranges of x. You might also plot the data points and the regression line on graph paper and see if there is any pattern you can comment on, e.g. data points more scattered or less scattered either side of the line for certain ranges of x.
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