The Reliability and Validity of Hans Eysenck's EPI Test
The aim of this investigation was to look at the reliability and
validity of Hans Eysenck's EPI Test. The EPI questionnaire comprises
of items of a 'yes/no' variety. They are essentially intended as
research tools (as opposed to diagnostic tools for use in clinical
settings) and, as such, 'they are regarded as acceptable, reliable and
valid' (Kline 1981, Shackleton and Fletcher, 1984).The Alternative
Hypothesis was that there would be a positive correlation between the
E and N scores for forms A and B of the EPI. The Null Hypothesis was
that there would not be a positive correlation between the scores for
forms A and B, and any such found relationship would be down to chance
factors operating.
The correlation study was carried out because we were looking for a
relationship between the E scores and the N scores for forms A and B
of Hans Eysenck's EPI Test. The independent variable and dependent
variable were not operationalised in this case because an experimental
method was not being used and this investigation used test re-test
reliability. A repeated measure design was used because it was quick,
economical and cancelled out individual differences. Eighteen naïve
psychology students, male and female were used for this investigation.
An opportunitive sample was used because it was quick, easy and could
be carried out in a classroom.
The results, taken from the Raw Score Data table and scatter graph
showed evidence of a positive correlation. However, to accept that
this result was significant, we subjected the data to further
statistical analysis. A Spearman Rho Correlation Coefficient test (Rs)
was chosen because the data was Ordinal and parametric assumptions
were not met. The outcome stated that with number of people equalling
18 and significance set at p=0.05 for a one tailed test, the
calculated value for the 'E' score was 0.87 and for the 'N' score was
0.90. The critical table value tells us that a value 0.464 and above
has a degree of accuracy to 0.
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..., M., Oort, F., & Sprangers, M. (2013). Significance, truth and proof of p values:
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The aim of the experiment was to support the assumption that the participant who had a higher (overweig...
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