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World 4 · Fit a Line · 14 min · PRO

Predict, but carefully

Extrapolation and regression to the mean

PRO · Data Detective

World 4: Fit a Line is part of PRO

The first world of Data Detective is free. PRO opens the other 25 lessons in 6 worlds — simulations, quizzes and all.

  • Does one go with the other?
  • The best straight line
  • What the line leaves behind
  • The hidden third thing
  • Which way does the arrow point?
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  • All 60 labs — every world, every lesson
  • Practice exams and certificates

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