EXM.1.SL.TZ0.2

pestleMathematicsAISLPaper 1EXM· sl-4-10-spearmans-rank-correlation-coefficientsource ↗

Kayla wants to measure the extent to which two judges in a gymnastics competition are in agreement. Each judge has ranked the seven competitors, as shown in the table, where 1 is the highest ranking and 7 is the lowest.

Calculate Spearman’s rank correlation coefficient for this data.

[5]

State what conclusion Kayla can make from the answer in part (a).

[1]

Markscheme / solution

average equal ranks M1

A1A1

${r_s} = 0.817$ A2

[5 marks]

There is strong agreement between the two judges. R1

[1 mark]

Examiners’ report

[N/A]