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Inferential testing (A-level only)

Inferential testing (A-level only)

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Question 41

An environmental biologist is researching the health of ancient woodlands. They want to determine whether there is an association between the soil quality and the density of the overhead canopy. They select 8 distinct zones within a nature reserve and record two scores for each zone:

  • Soil Quality Rating (SQR, scored out of 80), where a higher rating indicates richer, more nutrient-dense soil.
  • Foliage Density Score (FDS, scored out of 80), where a higher score indicates a thicker, more developed overhead canopy.

The ratings for each zone are displayed in the table below.

Table 1: SQR and FDS measurements for eight forest zones

ZoneABCDEFGH
SQR2234414558627179
FDS1940385148676576

With reference to levels of measurement, explain why Spearman's rank correlation coefficient (rho) is an appropriate statistical test to analyze the relationship between these two variables.

[2]
Markscheme

Inferential testing (A-level only) Questions

  1. A Level
  2. /Psychology
  3. /Inferential testing (A-level only)

121 exam-style questions on AQA A Level Psychology Inferential testing (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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