The coefficient of determination is a number between 0 and 1 used to measure the level of precision with which the regression model created fits the data. A measure of means that the model explains the entire variation between the two variables without error.
Therefore, in this case, if means that the 9 points are on the line
For this one I would add the measurements for the 3 shins and subtract it from 1.2. 0.125 + .09 + .75 = .965 Then... 1.20 - .965= .235 So... The fourth board has the width of .235 cm.
