Answer:
1. The slope is negative.
2. 0.81
Explanation:
The slope of the regression line is definitely negative
A linear equation has its regression line as
T = a + bc
The slope of the regression line is known as b.
From the question, b = -0.9
Therefore the slope of the regression line is negative.
B. Coefficient of determination = r²
r =(-0.90)
r² = 0.81
