question reagarding CI

#2
If you are asking what a Confidence Interval is, here is the answer (your question isn't very clear). There are no absolute values in statistics. Instead, think in terms of the probability that a value is a certain number. For example, if we give an IQ test and get a score of 110, the person's IQ is actually about 110. If we know the 95% Confidence Interval is 3, we can say the person's IQ is 110 +/- 3 with 95% certainty.
 

JohnM

TS Contributor
#3
Be careful here - the confidence interval is not a probability interval.

Under repeated long-term sampling, the 95% confidence interval will contain the true mean 95% of the time.

This is explained to a certain degree in the Confidence Interval post in our Examples section.