Originally Posted by

**tashirosgt**
Furthermore "that range" isn't a specific interval. "Confidence" is a property of a sampling *process*. It can't be interpreted as a probability applying to a single sample. For example, a sampling process may have 90% probability of producing an estimate that is within plus or minus 0.23 of a true population value. But if one application of the sampling process produces an outcome of 57, it is incorrect to to say that there is a 90% probability that the true value is in the interval (57 - 0.23, 57 + 0.23).

The only thing more galling than hearing people say critical things like this is - when they are right

I am probably guilty of this myself in this thread (I didn't go back to check), but, yes, in classical terms, it is the confidence interval that is random, and the process for generating it should make sure it includes the true (but unknown) parameter value with probability 0.90 or 0.95 (or whatever the level of confidence is) for a randomly generated sample.

People who live in glass houses, should get undressed in the dark.