correlation and regression significance

Correlation and Regression

, Correlation
A quantitative relationship between two interval or ratio
level variables

Explanatory Response
(Independent) Variable (Dependent) Variable
x y
Hours of Training Number of Accidents
Shoe Size Height
Cigarettes smoked per day Lung Capacity
Score on SAT Grade Point Average
Height IQ
What type of relationship exists between the two
variables and is the correlation significant?

, Correlation
 measures and describes the strength and direction of
the relationship
 Bivariate techniques requires two variable scores
from the same individuals (dependent and
independent variables)
 Multivariate when more than two independent
variables (e.g effect of advertising and prices on
sales)
 Variables must be ratio or interval scale