CAIE A-Level Biology A2 Formula Reference T Test Pearson Spearman and Degrees of Freedom Questions

Apply supplied t-test and correlation formulae to biological data, then use the correct sample-size or degrees-of-freedom row to assess significance.

Exam points

Calculate t from two means, sample standard deviations and sample sizes using the supplied formula
Calculate Spearman’s rank coefficient with the number of paired observations and retain its sign
Compare chi-squared or t with the correct critical value to explain a null-hypothesis decision
Use sample-size critical values to judge Pearson or Spearman correlation significance

No Questions Yet

Questions will appear here when available.