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CAIE A-Level Further Mathematics 4.2.2 Pooled Variance Estimate

Practise converting raw or summarised samples into sums of squared deviations and combining their degrees-of-freedom contributions into a pooled estimate.

Syllabus
2028–2030
Course
Further Mathematics 9231
Level
A2

Exam points

  • convert each sample variance or raw dataset into its sum of squared deviations
  • add the two sums and divide by the combined degrees of freedom before taking a square root

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