Thus far we have been fitting by eye. In order to make the
fitting more quantitative, we introduce a quantitative measure of how close the
fit and the data are. The difference between a fit point and a data
point is found by subtracting one from the other. The difference
may be positive or negative. Hence we square the difference giving a
quantity that is always positive and has its minimum (0) when the
data and the fit are equal. Enter the appropriate formula in the next
column as shown below.
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