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Topic 11: Research Methods – How do you carry out psychological research?
11.4 Reliability and Validity
11.4.1 Assessing Reliability
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What does reliability ensure in psychological research?
Outcomes reflect the concepts investigated
Reliability refers to the consistency of
results
Reliability focuses on the accuracy of the measure
False
What is an example of a highly reliable questionnaire?
Anxiety questionnaire with similar scores over time
Test-retest reliability measures the stability of a test over
time
A high correlation in test-retest reliability indicates
stability
What type of test should demonstrate high test-retest reliability?
IQ test taken weeks apart
Inter-rater reliability measures the consistency between different
raters
A high Kappa coefficient in inter-rater reliability indicates
agreement
What is an example of high inter-rater reliability in psychology?
Psychologists providing similar diagnoses
Test-retest reliability compares scores from the same test given at two different
times
Correlation statistics are used to assess
test-retest reliability
What is an assumption when assessing test-retest reliability?
No significant life events occur
Inter-rater reliability ensures that different raters independently reach similar
conclusions
High values of Pearson’s
r
r
r
in inter-rater reliability indicate strong agreement
In which scenario is inter-rater reliability crucial?
Reviewing patient cases
Parallel forms reliability assesses the consistency between two different versions of a
test
High correlation in parallel forms reliability indicates
agreement
What is an example of strong parallel forms reliability?
Two algebra tests with similar scores
Internal consistency reliability ensures that all items in a test measure the same
construct
Cronbach’s alpha values between 0.7 and
0.9
indicate good internal consistency
What is an example of high internal consistency in a Likert scale?
Job satisfaction statements with consistent responses
Longer tests tend to be more
reliable
Diverse samples can lower
reliability
What is used to quantify agreement between scores in reliability assessments?
Correlation coefficient
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