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Research methods and skills

Research methods and skills

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Question 5

Elena wanted to investigate the stress levels of night-shift and day-shift healthcare workers after participating in a 4-week mindfulness intervention.

She sampled two groups of workers who had completed the mindfulness programme:

  • 25 night-shift workers
  • 25 day-shift workers

Elena asked the workers to rate their post-intervention stress levels. She used a scale ranging from 1 to 10, where 1–5 was classified as ‘low stress’ and 6–10 was classified as ‘high stress’.

Table 1: Raw stress classifications by shift type
Shift TypeWorkers with ‘low stress’ post-interventionWorkers with ‘high stress’ post-intervention
Night-shift817
Day-shift1510

Complete Table 2 to calculate the chi-squared statistic (χ2\chi^2χ2) for Elena's data to two decimal places.

Table 2: Calculation table for Chi-squared
Observed (O)Expected (E)O–E(O–E)2(O–E)^2(O–E)2(O–E)2/E(O–E)^2 / E(O–E)2/E
Night-shift‘Low stress’811.5
‘High stress’1713.5
Day-shift‘Low stress’1511.5
‘High stress’1013.5
Chi-squared (χ2\chi^2χ2) =
[4]
Markscheme

Research methods and skills Questions

  1. A Level
  2. /Psychology
  3. /Research methods and skills

57 exam-style questions on Edexcel A Level Psychology Research methods and skills, covering Research methods and skills. Each one has a worked solution and a mark scheme showing where the marks go.

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