Key Concepts
- Two measurements (samples) are drawn from the same pair of individuals or objects.
- Differences are calculated from the matched or paired samples.
- The differences from the sample are used to conduct the hypothesis test.
- Either the matched pairs have differences that come from a population that is normal or the number of differences is sufficiently large (more than 30).
- The distribution that is used to conduct the hypothesis test on the differences is a t-distribution.
Glossary
Degrees of Freedom (df): the number of objects in a sample that are free to vary.
Matched or Paired Samples: when data is gathered from two similar subjects (or the same subject) to create a pair of data.