The heights, h h\,h cm, and masses, m m\,m kg, of 12 footballers give the regression line m=1.37h−173m=1.37h-173m=1.37h−173. Their heights range from 169 cm to 194 cm.
Interpret the gradient.
Estimate the mass at 170 cm.
Explain why predicting the mass at 205 cm is less reliable.