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MathidiaMathematics Academy
Statistics and data
Lesson 64 of 75
Challenge

Scatter graphs

Objective. Describe correlation and use lines of best fit cautiously.

  1. 1. Learn
  2. 2. Worked example
  3. 3. Practice
  4. 4. Feedback
  5. 5. Continue

Learn: the key idea

Scatter graphs develops a connected mathematical idea rather than an isolated trick. Compare distributions and communicate evidence responsibly. Begin by representing the quantities or relationships, choose a rule that fits, justify each transformation, and finish by checking units, signs, scale and whether the answer is reasonable.

Worked example

Does correlation prove causation?

no
Illustrated card showing no
  1. 1Identify the known information, the unknown and any conditions.
  2. 2Choose a diagram, table, graph or algebraic representation that exposes the structure.
  3. 3Apply the relevant rule one justified step at a time, keeping exact values where useful.
  4. 4Check by substitution, inverse reasoning or estimation. The result is no.

Answer: no

Concept mastery

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Practice

Practice happens on its own screen, one question at a time. Answers stay hidden until you submit yours, and you can stop and pick up at the same question later.

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Common mistake. A common error in scatter graphs is to copy a procedure without checking its conditions. Label the structure first and justify every sign, operation and unit.

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