Relationships Between Two Measurement Variables
Examples
Types of Relationships
A Deterministic Relationship
A Statistical Relationship
Three Methods
Scatter Plots
Scatter plot
Correlation coefficient (“r”)
Interpretation of r
r = +1
r = 0
r = 0.17
r = 0.91
Correlation not appropriate
r = 0.50
r = - 0.84
Linear Regression
Least Squares Estimation
Least Squares Line
Interpretation of Line
Use of Line for Prediction
Do not extrapolate!
Comparison of Pulse Rates
Cautionary Notes
Email: lsimon@stat.psu.edu
Home Page: http://www.stat.psu.edu/~lsimon/stat250/fa99/admin/
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