Inference Procedure For Paired Data
The table provides summary statistics for the improvements in test scores from a paired data design. Which of the following describes the correct method for analyzing these data?
| Sample Size | Mean Improvement | Standard Deviation of Improvements |
|---|---|---|
| 30 | 42.25 | 27.92 |
A
When using paired data, a two-sample t-test is appropriate as the two sets of scores are independent of each other.
B
For paired data, compute the differences for each paired observation and then use a one-sample t-test to construct a confidence interval for the mean difference.
C
For paired observations, pooling the data from both tests and calculating a single variance provides a more accurate assessment.
D
For paired data, conduct two independent t-tests on the ‘before’ and ‘after’ scores separately to analyze improvement.
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