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Inferential testing (A-level only)

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Question 39

Study Description

A researcher investigated whether using a blue-light screen filter before bedtime improves sleep quality. A sample of 25 participants rated their sleep quality before the trial and after one week of using the filter. The researcher categorized the changes in sleep quality as shown in Table 1 below.

Table 1: Sleep quality changes after one week of using a blue-light filter

Improved sleepDeteriorated sleepUnchanged sleep
Number of participants1852

Explain two reasons why it was appropriate to use the sign test in this study. Refer to the details of the study in your answer.

[4]

Inferential testing (A-level only) Questions

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

Practise AQA A Level Psychology Inferential testing (A-level only) with exam-style questions for A Level Psychology. 123 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank