Confidence Intervals for the Correlation Calculator

Required Input:

1. Observed correlation or partial correlation (*r*).

2. Degrees of freedom (*df*)

3. Number of predictors in the model (1 for the correlation, >1 for the partial correlation).

4. Desired confidence level.

5. Whether groups are fixed or random. Fixed groups are experimentally assigned whereas random groups refer to groups that are simply observed and thus the number of observations in each group will vary from sample to sample.

Java 6 or higher required. The applet may take several seconds to load.

**Standardized Mean Difference Confidence Interval Calculator Screenshot**