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Research methods and skills

Research methods and skills

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Question 17

Dr Vance wanted to investigate the effectiveness of two different relapse-prevention programmes for individuals recovering from alcohol addiction after 6 months.

He sampled two groups of patients who had completed their respective recovery programmes:

  • 30 patients who underwent Cognitive Behavioural Therapy (CBT)
  • 30 patients who underwent Mindfulness-Based Cognitive Therapy (MBCT)

Dr Vance assessed each patient's recovery status at a 6-month follow-up, classifying them as either ‘Abstinent’ or ‘Relapsed’.

Table 1: Observed recovery outcomes after 6 months
Therapy TypePatients who remained ‘Abstinent’Patients who ‘Relapsed’
CBT1218
MBCT219

Complete Table 2 to calculate the chi-squared statistic (χ2\chi^2χ2) for Dr Vance'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
CBT‘Abstinent’1216.5
‘Relapsed’1813.5
MBCT‘Abstinent’2116.5
‘Relapsed’913.5
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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