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Research methods and techniques

Research methods and techniques

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Question 175

An environmental scientist monitoring river pollution levels decides to use the Wilcoxon Signed-Ranks test instead of a paired ttt-test to analyse the differences in chemical concentration before and after a filtration process.

Identify two criteria regarding the data or population distribution that must be met to justify the use of a parametric test such as the paired ttt-test.

[2]
Markscheme

Research methods and techniques Questions

  1. A Level
  2. /Psychology
  3. /Research methods and techniques

644 exam-style questions on OCR A Level Psychology Research methods and techniques. Each one has a worked solution and a mark scheme showing where the marks go.

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