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CAIE A-Level Biology 16.2.3 Chi-Squared Tests in Genetics

Practise calculating chi-squared from observed and expected phenotype counts, then compare it with a critical value to judge whether deviations are significant.

Syllabus
2028–2030
Course
Biology 9700
Level
A2

Exam points

  • calculate expected counts and each (O − E)²/E contribution from phenotype data
  • compare χ² with the critical value and accept or reject the null hypothesis

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