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6.4.2: Pre-Test Two - Internal Consistency Assessment
In terms of test-retest reliability the scale was re-administered to 259 people 2-21 days after
its first administration. The first pre-test indicate overall reliability was Cronbach .892 and
second pre-test was 0.843. The purpose of test-retest reliability shows how constant scores
remain from one occasion to another. The rationale underlying reliability determinations of
this type is that if a measure truly reflects some meaningful construct, it should assess that
construct comparably on separate occasion (De Vellis, 2003).
In terms of test-retest reliability the scale was re-administered to 259 people 2-14 days after
its first administration. Overall reliability for Pretest One was Cronbach .892 and the second
Pretest was 0.843. The purpose of test-retest reliability is to show constancy of response
across tests. The test-retest result shows a Pearson correlation of .699 with statistically
significant responses. The rationale underlying reliability determinations of this type is that if
a measure truly reflects some meaningful construct, it should assess that construct
comparably on separate occasion (De Vellis, 2003).
Table 6.5: Assessing Test-Retest Reliability and Response Bias (Pre-Test 1 &2)
Pretest
One
Pretest
Two
100
Pretest
One
Pretest
Two
Pearson Correlation 1 .699**
Sig (2-tailed) .000
N 331 259
Pearson Correlation .699** 1
Sig (2-tailed) .000
N 331 259
Cron
Mean
Alpha Sample Difference t
.892 331 2.905 -
.516
Sig.
(2tailed)
Time
elapsed
between
pre-tests
.606 2-14 days
.843 259 2.977 15-19
days
A formal test of response bias was adapted following the procedure suggested by Oppenheim
(1966), cited in Gaur, Mukherjee, Gaur, and Schmid (2011). The test compares responses
received in 21 days apart between Pre Test 1and 2. The t-tests revealed no significant
difference between the early and late respondents.