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Inferential testing (A-level only)

Inferential testing (A-level only)

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Question 37

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]
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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