Question:medium
The paired t-test is best defined as which of the following?
The paired t-test is best defined as which of the following?
Show Hint
Paired = same subjects measured before and after.
Updated On: Jun 23, 2026
- Test used to assess quantitative observations before and after an intervention
- Test that is used when the observations are in the form of proportions (for qualitative data)
- Test applied when separate observations are made on individuals of two separate groups, and these need to be compared
- None
Show Solution
The Correct Option is A
Solution and Explanation
Step 1: Anchor the definition on the word "paired": the two sets of values must come from the same subjects, not from independent groups.
Step 2: The typical use is measuring a quantitative variable on each person, applying an intervention, then measuring again, and testing whether the within-person change (the before-after difference) is significant.
Step 3: Qualitative proportions need chi-square (rules out one option) and two unrelated groups need the unpaired t-test (rules out another), leaving the before-and-after quantitative comparison as the defining feature of the paired t-test. \[\boxed{\text{Quantitative observations before and after an intervention}}\]
Step 2: The typical use is measuring a quantitative variable on each person, applying an intervention, then measuring again, and testing whether the within-person change (the before-after difference) is significant.
Step 3: Qualitative proportions need chi-square (rules out one option) and two unrelated groups need the unpaired t-test (rules out another), leaving the before-and-after quantitative comparison as the defining feature of the paired t-test. \[\boxed{\text{Quantitative observations before and after an intervention}}\]
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