Simplify the following text for a Grade 9 native English-speaking person.
Original: A confidence interval with a particular confidence level is intended to give the assurance that , if the statistical model is correct , then taken over all the data that might have been obtained , the procedure for constructing the interval would deliver a confidence interval that included the true value of the parameter the proportion of the time set by the confidence level .
Simplified: The confidence interval is always given together with the confidence level .