# Math Help - Statistics Least Squared - Midterm Tomorrow!

1. ## Statistics Least Squared - Midterm Tomorrow!

By the method of least squares, fit y = Bx to the following n=6 points.

x 3 1 5 6 3 4
y 4 2 4 8 6 5

2. How about y = 1.25x. Good luck on that exam.

3. how did you decide on 1.25?

4. Well, it didn't really matter since your exam is today. If you don't know already, you're probably toast.

I would have preferred y = (36/23) + (41/46)x, with the usual Normal Equations, but you insisted that the intercept is zero, so that limited the choices and the least squares approximation turned out to be y = 1.25x.

Thus: $B \cdot \sum{x^{2}}\;=\;\sum{xy} \implies B\;=\;\frac{120}{96}\;=\;1.25$

Have you met Normal Equations? They ARE important.

5. ha you're right i had no idea how to do that problem today! oh well i answered every other question with ease thanks tho