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Curious Cat Management Improvement Library - Dictionary

Scatter Diagram (scatter plot) - display of data which shows visual correlation (or lack thereof) of two variables. Since people can much more quickly see patterns visually, as apposed to in a series of numbers, the diagram is a good tool to illustrate the effect to others in a briefing or report.
Statistically a regression line is the line through the data where the square of the difference between the line and each data point it least.

Related Terms:

Seven Basic Quality Management Tools
Seven Management and Planning Tools

Online Resources:

Scatter Plot overview from Skymark
Scatter Diagram overview from the Quality Assurance Project
Scatter Diagrams a tutorial from Clemson
Scatter Plot overview from the NIST Engineering and Statistics Handbook