Use the data in GPA1 for this exercise. (i) Add the variables mothcoll and fathcoll to the equation estimated and report the results in the usual form. What happens to the estimated effect of PC ownership? Is PC still statistically significant?
(ii) Test for joint significance of mothcoll and fathcoll in the equation from part (i) and be sure to report the p-value.
(iii) Add hsGPA2 to the model from part (i) and decide whether this generalization is needed.
Equation:
colGPA = 1.26 + 1.57 PC + .447hsGPA + 0.0087 ACT
(.33) (.057) (.094) (.0105)
n = 141, R2 = .219

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

need more info

step-by-step explanation:

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

1. perpendicular

2. parallel

3. perpendicular