
Regression equation
y= slope x (x) + intercept (x=0)

Regression Line Slope Eqautions
Formula for slope
To find out the slope of y you must know the average income and SD of y and x values
example:
 (x) Average education = 12.5 , SD = 3Average
 (y) Income = 30,000, SD = 24,000
 r=.25
= 2,000
to find the value of y when x =0
12.5 (Ave of x) 2000 = 25,000
were going to subtract 25,000 from the average y; to get y when x =0
30,00025,000 = 5000

Regression Equation
Predicted Income = x (xvalue) + (y when x=0)
 Note:
 to find the value of y when x =0
 Slope Formula x (x average) =z
 yz = y when x = 0

Regression Line r.m.s error
regression line also called least squared line, make rms error as small as possible

