A scatter plot displays paired numerical observations as points, helping reveal whether two variables have a relationship, its direction, and whether a linear trend is plausible. section 3.2.2
Use scatter plots to support correlation analysis and stakeholder decisions:
- Inspect whether a relationship is approximately linear before interpreting Pearson’s correlation. section 3.2.2
- Add a regression line when the trend is unclear and a linear relationship needs clearer communication. section 3.2.2
- Treat the plot as an early analytical deliverable, not a complete explanation of causes or a substitute for more sophisticated modeling. section 3.2.2
Temperature and rat sightings
A scatter plot of daily low temperature against daily rat sightings shows a clear positive relationship: warmer days correspond with more reports to the city’s 311 hotline. The pattern can inform preparations while further analysis investigates predictors of change. section 3.2.2
