The table is missing in the question. The table is attached below.
Solution :
Let X = appraised value
Y = area (square feet)
The regression line is given by :
The regression line is :
To estimate the error variance, we have:
Error variance,
ANSWER
D) sin Y
EXPLANATION
The given triangle is a right triangle.
This implies that that:
Then we have
Recall that
But
When we do the substitution, we get,
Therefore cos(x) is a equivalent to sin(y).
The correct answer is D.