A confidence interval is a range of values that is likely to contain the true value of whatever population parameter you may be trying to ascertain. Confidence level is the probability that the confidence interval actual contains the correct true parameter. You have a jar that contains quarters. You must guess how many quarters are contained, but you cannot see inside to make your guess. Instead of making one guess, you allow a few people to make a few guesses and come up with a range, between 60 and 80 quarters. This range of 60 to 80 quarters would be the confidence interval. A confidence level would come from performing this experiment many times and would suggest how often you want to be correct in your interval. If you say you have a 95% confidence level, it will mean that you would expect your range to include the actual number of quarters in the jar 95 times out of 100