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1. Exploratory Data Analysis
1.3. EDA Techniques
1.3.3. Graphical Techniques: Alphabetic Scatter Plot

Scatter Plot: Exact Linear (positive correlation) Relationship

Scatter Plot Showing an Exact Linear Relationship scatter plot showing exact linear relationship
Discussion Note in the plot above how a straight line comfortably fits through the data; hence there is a linear relationship. The scatter about the line is zero--there is perfect predictability between X and Y), so there is an exact linear relationship. The slope of the line is positive (small values of X correspond to small values of Y; large values of X correspond to large values of Y), so there is a positive co-relation (that is, a positive correlation) between X and Y.
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