Correlations & (Bivariate) Linear Regression Flashcards
1
Q
What do you use to predict Y for any X?
A
Best-fit line
2
Q
What is the sum of the residuals ( vertical distances between each point)?
A
0
3
Q
What is residual?
A
Vertical Distance from any point to the line
4
Q
What is the equation for best-fit line?
A
Y = a + bX
a: y intercept
b: slope
* Constant for each data set
5
Q
What is the equation for (b) slope?
A
b = [(x-xmean)+(x-xmean)][(y-ymean)+(y-ymean)
6
Q
What is the equation for (a) Intercept?
A
a = ymean - b (xmean)
7
Q
When solving for the equation of best-fit line, what do you have to solve first?
A
b ; Slope
