Definition of confidence interval
: a group of continuous or discrete adjacent values that is used to estimate a statistical parameter (such as a mean or variance) and that tends to include the true value of the parameter a predetermined proportion of the time if the process of finding the group of values is repeated a number of times
First Known Use of confidence interval
Learn More about confidence interval
Britannica.com: Encyclopedia article about confidence interval
Seen and Heard
What made you want to look up confidence interval? Please tell us where you read or heard it (including the quote, if possible).