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22 June, 01:25

Which shows the equation for the line of best fit for this data? Height (thousand ft) 2,3,4,5,6,7,8,9,10,11,12,13 Temperature F/deg 78,74,70,62,55,50,46,40,33,31,30,27

A) y=-5x

b) y=5x+87

c) y=-5x + 87

d) y=5x

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  1. 22 June, 01:35
    0
    That takes a bit of tedious calculation, but with the correct formula, anyone can find it:

    Let our line of best fit have the form:

    y=mx+b

    m = (nΣxy-ΣxΣy) / (nΣx^2-ΣxΣx)

    b = (Σy-mΣx) / n

    Where of course Σ means the sum and n=number of elements in the data set.
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