Fit the Line, Then Measure the Miss

A greenhouse technician applies a different dose of fertilizer to each of six identical seedlings and measures the growth after four weeks:

Fertilizer $x$ (g)	$1$	$2$	$3$	$4$	$5$	$6$
Growth $y$ (cm)	$3$	$4$	$7$	$9$	$11$	$14$

An ordinary least-squares line $\hat{y} = b_0 + b_1 x$ is fitted to all six points using

$b_1 = \frac{\sum (x_i - \bar{x})(y_i - \bar{y})}{\sum (x_i - \bar{x})^2}, \qquad b_0 = \bar{y} - b_1 \bar{x}$

What is the residual for the seedling that received $x = 5$ grams?

Keep the sign of the residual, and round your answer to 2 decimal places.