Pearson Edexcel IAL Mathematics S3.5.1 Spearman’s rank correlation

Practise converting paired measurements into ranks, finding Spearman’s r_s, interpreting strength and direction, and handling tied ranks conceptually.

Exam points

rank paired observations and compute d² values before applying the r_s formula
explain that tied data require average ranks and a different correlation formula

[Maximum number: 4]

The table shows the season's best times, x seconds, for the 8 athletes who took part in the 200 m final in the 2021 Tokyo Olympics. It also shows their finishing position in the race.

Table for Question S3.5.1 - Spearman’s rank correlation question 1 — Edexcel A-Level Mathematics A2

Given that the fastest season's best time is ranked number 1

calculate the value of the Spearman's rank correlation coefficient for these data.

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S3.5.1 - Spearman’s rank correlation question 1