CAIE A-Level Biology A2 Statistics Notes Choosing Valid Statistical Methods Questions

Match the purpose of a biological investigation to a statistical method, distinguishing observed–expected counts, two-sample mean comparisons and correlations.

Exam points

Choose chi-squared to compare observed phenotype or genotype counts with expected frequencies
Select a t-test when the investigation compares the means of two biological samples
Choose Pearson or Spearman correlation to test an association between two biological variables

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