Fill in the blank: when using the least squares method, the line of best fit is the line that

a- minimizes the total area of error squares on the scatter plot
b- minimizes the sum of the squared deviations of the data points from the line
c- both a and b
d- none of the above

Step-by-step explanation:

Let ABCD be the parallogram.

A,B,C and D are vertices in that order.

Since ABCD is a parallelogram, we get opposite sides are parallel

AB || CD

AD is a transversal making interior angles as A and D

By parallel lines properties we have A +D =180...i

Similarly since BC||AD, and AB is a transversal

Angle A+B =180...ii

We have from i and ii, Angle B = angle D

On the same grounds, as above, we can prove that

Angle A = Angle C

It follows that in a parallelogram opposite angles are equal.