practical Flashcards
aim
investigate whether cognitive interview results in more accurate recall than standardised, measured on a list of 10, after witnessing a short film clip
hypothesis
more points recalled out of 10 from a clip of ‘the meg’ in cognitive interview compared with standard when ppts answer the questionnaire 2 days after watching film clip
null hypothesis
no significant difference between amount of points out of 10 recalled from film clip of ‘the meg’ in 2 different conditions and any difference due to chance
procedure
- selected 2 min clip from ‘the meg’
- devised quantitative score sheet out of 10 to measure DV (remembering)
- IV was type of interview
- ppts briefed and shown clip
- interview 2 days later both groups had 5Qs
- 1st question the same
- standard interview had 1 leading Q
- cognitive had the 4 techniques
- ppts given 8 mins to recall
- ppts debreifed and thanked
sample
12 ppts, opurtunity sample, independant group
scoring
to gain quantitative measure we scored answers out of 10 based on references
e. g.
1. person in cage notices shark
2. hero jumps in to save her
3. o2 mask breaks and she is running out of air
results
mean scores
correct for cognitive = 4
incorrect for cognitive = 5
correct or standard = 3.2
incorrect for standard = 6.8
drew bar chart and did chi2 test
- observed chi2 was 0.13 which was less than critical value of 2.71 at 5% significance for 1 tailed so not significant and we accept null hypothesis
leading Q in standard interview made 60% of ppts mention blood compared to 16.6% in cognitive interview
evaluation
- small sample size so extraneous variable would have more of an impact
- 2 people had watched the film
- opportunity sample so lacked generalisability
- lots of subjectivity when reviewing whether a point should be given
- standardised procedure
- inter rate reliability
- quantitative scoring method
