Question

Danila breeds peregrine falcons. She recorded the breadth (in mm) of each egg and the mass (in g) of the falcon

chick that hatched from it.
After plotting her results, Danila noticed that the relationship between the two variables was fairly linear, so she
used the data to calculate the following least squares regression equation for predicting the mass of the chick
from the breadth of the egg:
y = -47 + 2x
What is the residual of a 29 g falcon chick who hatches from an egg with a breadth of 40 mm ?

Answer 1

-4

Explanation:

trust me.

Answer 2

residual = - 4

Explanation:

The residual is the difference between the actual mass of the falcon chick and the mass our regression line would have predicted.

residual = actual mass - predicted mass

actual mass = 29 grams

The predicted mass of 40 mm breadth of egg can be calculated by using the regression equation Danila came up with.

predicted mass

y = -47 + 2(40)

y = -47 + 80

y = 33 grams

residual = actual mass - predicted mass

residual = 29 - 33

residual = - 4