Question at position 41 A cognitive development test is administered to 1,000 fourth graders across the country, and then it is readministered to the same children 90 days later. The test-retest results will yield an evaluation of which of the following? Cross-cultural fairnessReliabilityFactor analysisValidity单项选择题
A
Cross-cultural fairness
B
Reliability
C
Factor analysis
D
Validity

Question

Question at position 41 A cognitive development test is administered to 1,000 fourth graders across the country, and then it is readministered to the same children 90 days later. The test-retest results will yield an evaluation of which of the following? Cross-cultural fairnessReliabilityFactor analysisValidity单项选择题

A

Cross-cultural fairness

B

Reliability

C

Factor analysis

D

Validity

BlackTom AI · Accepted Answer

Reliability refers to the consistency or stability of test scores across repeated administrations, so a test given to the same pupils twice (90 days apart) is evaluating test-retest reliability.

1) Relevant knowledge points and concepts
- Reliability: degree to which a test yields consistent, repeatable results. One form is test-retest reliability (stability over time).
- Validity: whether the test measures what it purports to measure (different concept than stability).
- Factor analysis: a statistical method to discover underlying constructs from item correlations (not a direct measure of repeatability).
- Cross-cultural fairness: concerns bias or applicability of a test across different cultural groups.

2) Step-by-step reasoning process
- Step 1: Administer the cognitive test at Time 1 to the 1,000 fourth graders.
- Step 2: Readminister the same test to the same children at Time 2 (90 days later).
- Step 3: Compare each student’s score at Time 1 with their score at Time 2 to assess consistency.
- Step 4: Quantify the relationship by computing a test-retest statistic (typically Pearson correlation).

3) Calculation steps (how test-retest reliability is computed)
- Compute mean of Time1 scores (x̄) and Time2 scores (ȳ).
- For each student i, calculate deviations: xi − x̄ and yi − ȳ.
- Compute sum of products Σ(xi − x̄)(yi − ȳ).
- Compute sums of squares Σ(xi − x̄)² and Σ(yi − ȳ)².
- Pearson r = Σ(xi − x̄)(yi − ȳ) / sqrt[Σ(xi − x̄)² · Σ(yi − ȳ)²].
- A high r indicates strong test-retest reliability.

4) Why the correct answer is correct
Because the design explicitly measures the same test on the same individuals at two time points, it assesses score stability—exactly what test-retest reliability is intended to evaluate.

5) Why the other options are incorrect
- Cross-cultural fairness: would require comparing groups from different cultural backgrounds to detect bias; not indicated here.
- Factor analysis: uses item-level correlations to identify latent factors; it’s not measured by repeated administrations.
- Validity: concerns whether the test measures cognitive development (content/construct/criterion validity), which requires different evidence than temporal consistency.

6) Conclusion
The described procedure yields an evaluation of Reliability. This matches the provided correct answer: Reliability.

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