Overview for Paired t

Use Paired t to do the following:
  • Determine whether the mean of the differences between two paired samples differs from 0.
  • Calculate a range of values that is likely to include the population mean of the differences.

The paired t-test is useful for analyzing the same set of items that were measured under two different conditions, differences in measurements made on the same subject before and after a treatment, or differences between two treatments given to the same subject.

For example, managers at a fitness facility use a paired t-test to determine whether their weight-loss program is effective. If the mean of the differences is different from 0, the managers use the confidence interval to determine whether the difference is practically significant.

Where to find this analysis

  • Mac: Statistics > 2-Sample Inference > Paired t
  • PC: STATISTICS > Two Samples > Paired t

When to use an alternate analysis

If you have two samples of independent observations, use a 2-Sample t instead. For more information, go to How are dependent and independent samples different?.

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