21 Questions
Which reliability model assumes unequal true score variance, unequal means, and unequal error variances?
Congeneric
Which reliability model assumes equal true score variance, equal means, and unequal error variances?
Tau-Equivalent
Which model is considered the most strict and only exists in theory?
Parallel
Which reliability model assumes equal true score variance, equal means, and equal error variances?
Parallel
Which reliability model assumes equal true score variance, unequal means, and unequal error variances?
Essentially Tau-Equivalent
Which model is considered the least strict?
Congeneric
What reliability model do we assume Cronbach's alpha?
Essentially Tau-Equivalent
In practice, data obtained in the “real world” will only satisfy:
Congeneric and Essential Tau-Equivalent models
What does the mean inter-item correlation measure in relation to internal consistency reliability?
If individual questions on a test or questionnaire give consistent, appropriate results
At approximately how many items does the increase in Cronbach's alpha become more gradual and potentially less beneficial?
Around 15 items
What pattern is observed when examining the relationship between the mean inter-item correlation and Cronbach's alpha?
Cronbach's alpha rises rapidly up from 2 to 8 items, and then increases more gradually.
Why might a more homogenous sample yield lower reliability estimates than a heterogeneous sample?
Greater homogeneity implies less variance, resulting in smaller inter-item correlations.
What type of research examines the degree to which test score reliability from a particular measure is consistent across samples?
Reliability generalization study
What is a reliability generalization study?
A study that examines the degree to which test score reliability from a particular measure is consistent across samples.
Why is it inappropriate to say that a test is reliable?
Because reliability is a property of tests, not test scores, and it is sample dependent
Which sample size is required for respectable confidence when the reliability is 0.70?
400
Which sample size is required for respectable confidence when the reliability is 0.90?
100
What is the relationship between sample size and confidence intervals associated with Cronbach's alpha?
The larger the sample size, the greater the confidence.
Which coefficient is a more modern approach to estimating internal consistency reliability?
Coefficient omega
What is the key difference between coefficient alpha and coefficient omega?
Coefficient alpha assumes essential tau-equivalence, while coefficient omega does not
Which coefficient is a better estimate of internal consistency reliability?
Coefficient omega
Test your knowledge of different forms of test equivalence with this quiz! From parallel to tau-equivalent, see if you can differentiate between the different types of equivalence and their characteristics.
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