Overview
Scatter plots are used to explore the relationship (correlation) between two numerical variables. Each point on the plot represents a single observation. They are excellent for identifying clusters, outliers, and the strength/direction of a relationship.
Key Concepts
- Correlation: Positive (points move up-right), negative (points move down-right), or none.
- Trend Lines: Often added to visualize the overall direction of the data.
- Third Variable: Can be added using color or shape for the points.
Use Cases
- Identifying the relationship between height and weight.
- Analyzing the impact of advertising spend on sales.