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📘 Read what each point represents

A scatterplot places paired measurements on two quantitative axes. The horizontal axis usually holds the explanatory variable, and the vertical axis holds the response. One dot represents one case, not a separate category or a count unless

3
lessons
~15 min
to learn
Adults
level
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What you’ll learn

  1. Axes and directionLabel axes and describe direction, form, and strength.Each point is one case; read the cloud before fitting a line.
  2. Outliers and clustersFlag unusual points and separate subgroups.Outliers and clusters reveal structure a single summary can hide.
  3. Residuals and readingUse residual plots and a bounded five-part reading.Residuals test the model; association alone does not establish causation.

Questions this course answers

What does direction describe in a scatterplot?

Direction is the broad upward or downward movement of the point cloud.

Which pattern calls a straight-line summary into question?

A curve indicates that the relationship's form is not well described by one straight line.

What is a responsible first response to an outlier?

An unusual point may be an error or a valid case, so its provenance should be checked first.

What does a funnel-shaped cloud suggest?

A widening or narrowing cloud indicates non-constant spread.

Why should a scatterplot reading include a boundary?

A bounded claim states where the observed pattern applies and avoids causal overreach.

Grounded in trusted sources

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Every Wunder lesson is built from real, reputable sources — never invented.

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