🔹 Relationship Charts - Scatter & Bubble Charts

Last Updated: 23 Sept 2025

Relationship Charts show how two (or more) numeric variables are related.

• Scatter Chart → show correlation between 2 variables.
• Bubble Chart → scatter chart + size of points = extra dimension.

✏ When to Use Relationship Charts?

• When both variables are numeric.
• To check correlation or patterns.
• To spot outliers (points that don't follow trend).

🎨 Color & Style Tips

1. Use different colors for different groups.
2. Use size in Bubble Chart to represent extra info.
3. Soft colors and transparency (alpha) improve readability.

Do & Don't

$\checkmark$ Do

• Label x-axis and y-axis.
• Use legend for groups.
• Add grid for better reading.

✘ Don't

• Don't overcrowd with too many points.
• Don't ignore outliers — they are important insights.
• Don't use confusing colors or sizes.

1. Scatter Chart

Let us consider the following data:

hours = [2,4,6,8,10]
scores = [30,50,65,80,90]

You want to create a scatter chart to show the relationship between study hours and exam scores.

2. Colored Scatter Chart (Multiple Groups)

Let us consider the following data:

hours_a = [2,4,6,8,10]
scores_a = [30,50,65,80,90]

hours_b = [1,3,5,7,9]
scores_b = [25,45,60,75,85]

You want to create a colored scatter chart to show the relationship between study hours and exam scores for two groups.

3. Bubble Chart

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