National Institute of Standards and Technology (NIST)
Nist: Engineering Statistics Handbook: Scatter Plots and Linear Regression
An explanation of scatter plots followed by examples of the many different kinds of scatter plots.
Khan Academy
Khan Academy: Positive and Negative Linear Associations From Scatter Plots
Practice identifying the types of correlations shown in scatter plots. Sometimes we see linear correlations (positive or negative), sometimes we see non-linear correlations (the data seems to follow a curve), and other times we don't see...
Texas Education Agency
Texas Gateway: Tea Statistics: The Regression Equation
A tutorial on how to find the line of best fit or least-squares regression line for a set of data in a scatter plot using different methods and calculations.
Texas Instruments
Texas Instruments: Boat Registration and Manatee Deaths in Florida
Students will explore the data on boat registrations and manatee deaths in Florida. They will use the data, the graph of the data and the line of best fit to make predictions about the relationship of the data.
Other
Correlation Coefficients
This page provides a good discussion of correlation coefficients (r,) which indicate the "strength of the linear association between variables." Includes formulas and scatter plots. Some prior knowledge of statistics might be helpful.