#### Understanding

A model that "fits" the data well minimizes the sum of the absolute deviations from line.

### What to look for

To analyze how well a linear equation "fits" the data, construct a scatter plot of the residuals for any patterns or predictability. Models that result in a pattern in the residual plot do not model the data well.### Sample Assessment

The scatter plot below shows the relationship between height, in centimeters, and the arm span, in centimeters, of 15 students in a class.

Based on the scatter plot, determine which ordered pair would be the farthest from the best fit line.

a) A

b) B

c) C

d) D

Answer: D