Matching Reliability Types with Error Sources

This question requires matching different types of reliability with their primary sources of error variance. Below is a breakdown of each type and its corresponding error source:

Reliability Type Explanations

• A. Test-retest Reliability: Measures consistency over time. The main error source is fluctuations in conditions or the respondent's state from one testing session to another. This relates to time sampling.
• B. Alternate Form (delayed) Reliability: Assesses consistency between different forms of a test administered at different times. Error arises from differences in test items (content sampling) and changes over time (time sampling).
• C. Coefficient Alpha (Internal Consistency): Measures how well items on a test correlate with each other. It reflects the homogeneity of the items measuring a single construct. The key error source is content heterogeneity (i.e., whether items are measuring the same thing).
• D. Kohen's Kappa: Used to measure agreement between two or more raters. The variance arises from differences in how raters interpret criteria or score responses, representing inter-scorer differences.

Correct Matches

Based on the definitions:

• Test-retest reliability (A) matches with Time sampling (III).
• Alternate Form (delayed) reliability (B) matches with Content sampling and time sampling (IV).
• Coefficient alpha (C) matches with Content heterogeneity (I).
• Kohen's Kappa (D) matches with Inter-scorer differences (II).

Therefore, the correct matching is A-III, B-IV, C-I, D-II.