# Statistics > Confidence Intervals > Matched Pairs

This utility computes confidence intervals for the mean of the differences between matched pairs. The confidence interval estimate of the mean of the differences between matched paris μd is:

where the margin of error E is given by , is the mean of the differences between sample matched pairs, and is the mean of the differences between population matched pairs.

### Dialog Inputs

The sample data can be inputted in one of two ways:

- Samples in columns: The sample matched pairs are provided in two columns, and the two values in a matched pair are provided in the same row. Select the column containing values of the first sample in First Sample: drop-down menu. Select the column containing values of the second sample in Second Sample: drop-down menu.
- Summarized Sample Data: The sample size, mean, and standard deviation are provided (instead of individual sample values).

The confidence level must be between 0 and 1. For example, enter 0.95 for a 95% confidence level.