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    Attached is my working. I am confident the least squares straight line of best fit is correct (to 2 d.p.).

    "For each 𝑥𝑖, calculate the least squares estimate for 𝑦i"

    Have I done that? And if not, what do I need to do? Is it asking me to sub in the xi values into my line equation and calculate the output for each yi?

    "and briefly comment on the accuracy of the estimates."

    What sort of thing would I write to explain the variation?
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    Attached is the y calc approximations.

    Can anyone help me with a comment on their accuracy, as per the question?
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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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