A-LevelPsychologyResearch methods9990/21 · Oct/Nov 2021 · Q22 Marks

Dement and Kleitman (sleep and dreams) compared dream duration estimates for 5-minute and 15-minute REM periods.

Mark scheme

Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.

1 mark for a muddled (experimental) null hypothesis
2 marks for a clear (experimental) null hypothesis
The hypothesis does not have to be operationalised for 2 marks
Any difference between estimates of dream duration for different length REM periods is due to chance = 2
There will be no difference between dream duration estimates for different length REM periods = 2
Dream duration for different length REM periods will be the same = 1
There will be no difference between dream duration and length of REM period = 0
Any correlation between estimates of dream duration for different length REM periods is due to chance = 0
There will be no correlation between dream duration estimates and length of REM period = 0

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Topic: Research methods, A-Level Psychology (syllabus 9990). Structured question, 2 marks.
Source: A-Level Psychology, Oct/Nov 2021 Paper 2 Variant 1, question 2.

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