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The "Best-Fit" Line

The "best-fit" line is the straight line which passes as near to as many of the points as possible. By drawing such a line, we are attempting to minimise the effects of random errors in the measurements.

For example, if our points look like this

our best-fit line should be as shown in the next diagram.

Notice that the best-fit line does not necessarily pass through any of the points plotted.

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