Scatterplots & Correlation
by Anonymous
Read the relationship between two quantities from how the points scatter, fit a trend line by eye, and see why predictions hold only inside the data's range.
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About this app
Scatterplots & Correlation is an interactive middle-school statistics activity for reading relationships between two quantities from the shape of scattered points. Explore strong or weak positive and negative correlation, no correlation, adjust a line’s slope and intercept to fit the data, and compare interpolation with risky extrapolation.
Use cases
- Middle-school students learning scatterplots and correlation
- Teachers demonstrating positive, negative, and zero correlation
- Learners practicing slope and intercept in a visual context
- Students exploring why predictions outside the data range can be unreliable
Features
- Cycles through five scatterplot patterns, from strong positive to strong negative correlation
- Shows data points as paired values and explains the direction and strength of relationships
- Adjusts slope and intercept with step controls while displaying the fitted line
- Visualizes gaps between data points and the current line to compare fit quality
- Tests guesses inside and outside the data range, including an unrelated-data example
- Includes guided missions with reset and next controls