Scatter Plots

Sleep vs. Mood — Maths Lesson

Does sleep affect your mood?

Plot your data, find the trend, and discover the relationship between hours of sleep and mood level.

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Input — What is a scatter plot?

A scatter plot shows the relationship between two variables. Each point represents one observation. The x-axis (horizontal) shows one variable; the y-axis (vertical) shows the other.

Do you think the amount of sleep affects your mood? Let's test this with real data.

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Practice — Plot your data

Adjust the sliders to match your hours of sleep last night and your mood level, then click Add my point. You can also click directly on the chart to plot a point.

💡 Data is saved on this device only. To share with the class, use Export and have the teacher import all points on one screen.
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Points plotted
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Correlation (r)
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Relationship
Line of best fit
As sleep increases, mood tends to …
#Sleep (hrs)Mood (1–10)
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Examples — Real-world scatter plots

Here are four examples showing different types of correlation. Can you identify each one?

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Exercises — Identify the correlation

Look at each example above and decide: is there a positive, negative, or no correlation?

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Product — Draw & discuss

Turn on the line of best fit above. Describe the trend in your own words, then discuss the questions below.

Describe the trend: "As sleep increases, mood tends to…" — or is there no clear pattern?

How could this data help people during a disaster (e.g., rescuers working long shifts)?

What other variable pairs might show a correlation? Think of your own example.