Chapter 12 Regression Line

  1. Regression equation
    y= slope x (x) + intercept (x=0)
  2. Regression Line Slope Eqautions
    Image Upload 1 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

    Image Upload 2 = 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

    30,000-25,000 = 5000
  3. Regression Equation
    Predicted Income =Image Upload 3  x (x-value) + (y when x=0)

    • Note:
    • to find the value of y when x =0 

    • Slope Formula x (x average) =z 
    • y-z = y when x = 0
  4. Regression Line r.m.s error
    regression line also called least squared line, make rms error as small as possible
Author
damea134
ID
280540
Card Set
Chapter 12 Regression Line
Description
Regression Line
Updated