Old Faithful Eruptions
Eruption durations and waiting times for the Old Faithful geyser — the classic two-cluster scatter plot.
Each row is one eruption of Old Faithful in Yellowstone National Park: duration of the eruption and the wait until the next one.
Small, famous, and perfect: the scatter plot has two visible clusters, the correlation is strong, and prediction via regression actually works. This is the dataset where prediction “clicks” for most students.
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