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Scientific processes

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Question 107

Study Description: Blue-Light and Sleep Quality

A cognitive psychologist wanted to investigate whether blocking blue-light before bed affects sleep quality in young adults. Previous research indicated that reducing blue-light exposure before bedtime improves self-reported sleep quality.

The researcher decided to use a repeated measures design with a sample of 25 university students.

  • Condition A: Students used a blue-light filtering app on all digital screens for one hour before going to bed every night for one week.
  • Condition B: Students used their digital devices with normal screen settings for one hour before going to bed every night for a different week.

At the end of each week, students rated their average sleep quality on a scale of 1 to 10 (where 1 represented extremely poor sleep and 10 represented excellent sleep).

Explain why a repeated measures design was more appropriate than an independent groups design in this study.

[2]

Scientific processes Questions

  1. A Level
  2. /Psychology
  3. /Scientific processes

Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 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