University of Hawai'i
University of Hawaii: Understanding Correlation
This page gives a lot of information on correlation, including a section on the coefficient of correlation.
Science Education Resource Center at Carleton College
Serc: The Evolution of Pearson's Correlation Coefficient
For this activity, students explore nine scatter plots to develop their understanding of how two quantitative variables are related. Through an exploration of the properties of this association, they come to understand the standard...
Wolfram Research
Wolfram Math World: Correlation Coefficient
This is an elaborate site pertaining to the Correlation coefficient. The site begins with a brief introduction to what the correlation coefficient represents then goes into detail on how to find this value. The site has many links and...
Texas Instruments
Texas Instruments: Scatterplots and Correlation With Ti 89
Students input data relating the values of one variable associated with values of another and use these data to generate a scatterplot. From the scatterplot, they determine whether there is a correlation between the two variables and...
CK-12 Foundation
Ck 12: Algebra: Factoring When the Leading Coefficient Equals 1
[Free Registration/Login may be required to access all resource tools.] This lesson covers factoring quadratics when the leading coefficient is 1.
Khan Academy
Khan Academy: Correlation Coefficient Intuition
Match correlation coefficients to scatterplots to build a deeper intuition behind correlation coefficients. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Texas Instruments
Texas Instruments: Da Vinci's Proportions
This activity is designed to help students work with linear regression models, error, correlation coefficients and coefficients of determination. In this activity students not only deal with the mathematical concepts of regression but...
Wolfram Research
Wolfram Math World: Correlation Coefficient
MathWorld offers a technical, yet informative, explanation of the correlation coefficient for bivariate normal distribution.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Least Squares Regression
Create your own scatter plot or use real-world data and try to fit a line to it. Explore how individual data points affect the correlation coefficient and best-fit line.
Other
Stat Soft: Statistics Glossary
Dozens of statistical terms are defined and illustrated in this glossary.
CK-12 Foundation
Ck 12: Statistics: Linear Regression Equations
[Free Registration/Login may be required to access all resource tools.] Use a calculator to create a scatter plot and to determine the equation of the line of best fit.
Wolfram Research
Wolfram Math World: Spearman Rank Correlation Coefficient
This page gives a description of the Spearman Rank Correlation Coefficient, which is an approximation to the exact correlation coefficient, r. It is somewhat easier to compute than the exact correlation coefficient. Also provides links...
Rice University
Hyper Stat Online Statistics Textbook: Coefficient
A definition of a coefficient, as used in statistics, that includes an example.
National Council of Teachers of Mathematics
Nctm: Illuminations: Linear Regression 1
An interactive program where students will explore regression lines. Students will be introduced to the correlation coefficient and come to understand what it represents through the given exploration. Requires Java.
Texas Instruments
Texas Instruments: Describing Bivariate Data (Two Quantitative Variables)
Students explore the relationship between two quantitative variables in bivariate data using various x-y plots. They compare the relationships for several categories on the same plot. Students calculate the correlation coefficient to...