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EnglandGeographyQuick questions
Component 1 and 2: Geographical Skills and Fieldwork
Quick questions on Statistical skills and data analysis: averages, dispersion and Spearman's rank - OCR A-Level Geography
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is percentage change?Show answer
Percentage change standardises change so that places or times of different sizes can be compared. It is calculated as
What is spearman's rank correlation?Show answer
Spearman's rank correlation coefficient () tests the strength and direction of the relationship between two variables by ranking them. It is calculated as
What is significance testing?Show answer
A calculated must be checked for statistical significance to judge whether the relationship is real or could be due to chance. The calculated value is compared with a critical value from a significance table for the relevant sample size () and chosen significance level, commonly (the confidence level, meaning a chance the result is random). If the calculated exceeds the critical value, the result is significant and the null hypothesis (that there is no relationship) is rejected; if it does not, the relationship cannot be distinguished from chance. Significance depends strongly on sample size: the same coefficient is significant in a large sample but not a small one, which is why fieldwork needs an adequate, justified sample.
What is q1?Show answer
State the formula for percentage change. [2 marks]
What is q2?Show answer
A Spearman's rank coefficient is and exceeds the critical value at the level. Interpret this result. [3 marks]
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