Answer: b
Explanation:
The line of best fit to a scattergram is obtained in linear regression analysis by minimizing the sum of the squared errors.
For example, in the diagram shown below, there are n data points in the scattergram.
The error for the i-th data point is [tex]e_{i}[/tex].
The coefficients (a and b) for the line of best fit are determined using calculus, to minimize [tex]\sum_{i=1}^{n} e_{i}^{2}[/tex].