Answers.com says it is: A statistical range with a specified probability that a given parameter lies within the range.
I think that means, just how confident you are that your statistical analysis...
I have always been careless about the use of the terms "significance level" and "confidence level", in the sense of whether I say I am using a 5% significance level or a 5% confidence level in a...
See:
http://en.wikipedia.org/wiki/Confidence_interval
Includes a worked out example for the confidence interval of the mean of a distribution.
In general, confidence intervals are calculated from...
Confidence intervals may be calculated for any statistics, but the most common statistics for which CI's are computed are mean, proportion and standard deviation.
I have include a link, which...