Calculating Spearman's rank correlation coefficient (Edexcel GCSE Statistics): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does Spearman's rs measure?
What does Spearman's rs measure?
Strength of relationships using ranks
Range of Spearman's rs coefficient?
Range of Spearman's rs coefficient?
-1 to 1
What is the first step to calculate rs?
What is the first step to calculate rs?
Rank the data
How do you handle tied ranks in data?
How do you handle tied ranks in data?
Assign average ranks
What is the formula for Spearman's rs?
What is the formula for Spearman's rs?
rs = 1 - (6Σd²)/n(n²-1)
If rs = 0.9, what does this indicate?
If rs = 0.9, what does this indicate?
Strong positive correlation
What does an rs of -0.85 suggest?
What does an rs of -0.85 suggest?
Strong negative correlation
In the worked example, what was the summed squared difference (Σd²)?
In the worked example, what was the summed squared difference (Σd²)?
16
What does an rs of 0 imply?
What does an rs of 0 imply?
No correlation
What is the main mistake when calculating rs?
What is the main mistake when calculating rs?
Ignoring ties