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Inferential Statistics in Psychology

Study Edexcel Psychology inferential-statistics questions by choosing tests, using significance levels and interpreting probability-based conclusions.

Syllabus
2026
Course
Psychology XPS01/YPS01
Level
A2

Exam points

  • Choose an inferential test by matching the data type, design, level of measurement and research aim.
  • Use the stated significance level or probability value to decide whether findings are statistically significant.
  • State the conclusion cautiously, linking the decision to the null hypothesis and the research result.

9.1.12 - Inferential statistics question 1

[Maximum number: 6]

Daisy wanted to use a correlational research method to investigate whether aggression and exposure to media violence were linked. She decided to use a questionnaire to gather her data.

Question (a)

(a)

Daisy completed her investigation and analysed her data. She scored responses to the questionnaires for aggression, with a score of 20 indicating very aggressive. Daisy also scored the exposure to media violence, with a score of 20 indicating significant exposure to media violence.

Calculate the Spearman's rank correlation coefficient for the data gathered by Daisy by completing Table 2.

The formulae and statistical tables can be found at the front of this paper.
You must show your working out and give your answer to three decimal places.

Table 2 Space for calculations

Table 2 Space for calculations

Spearman's rank correlation coefficient

[ 4 ]

Question (b)

(b)

Interpret the Spearman's rank correlation coefficient from 8(c) in terms of the strength and direction for Daisy's investigation.

[ 2 ]
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