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Inferential Statistics Decisions

Study inferential statistics decisions in Pearson Edexcel A Level Psychology through Wilcoxon calculations, significance testing, error types and scenario-based interpretation.

Syllabus
First assessment 2026
Course
Psychology XPS01/YPS01
Level
AS

Exam points

  • Calculate Wilcoxon T values by ranking differences, summing ranks and comparing with critical values.
  • Interpret p-values, one-tailed tests, Type I errors and sense checks in research scenarios.

2.2.12 - Inferential statistics decisions question 1

[Maximum number: 1]

Kaleb investigated the effect of leading questions on eyewitness recall. He showed a video clip to 30 participants and then asked them three questions about what they had seen in the video clip. The experimental group was asked the same three leading questions, the control group was not asked any leading questions.
The results are shown in Table 3.

Table 3

Table 3

Identify the level of measurement for the data in Table 3.

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