# Chapter 12 Regression Line

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 Author: damea134 ID: 280540 Filename: Chapter 12 Regression Line Updated: 2015-08-11 06:40:40 Tags: Regression Line Folders: Description: Regression Line Show Answers:

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1. Regression equation
y= slope x (x) + intercept (x=0)
2. 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

30,000-25,000 = 5000
3. Regression Equation
Predicted Income =  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

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