Simplify the following text for a Grade 4 native English-speaking person.
Original: We can not say : `` with probability ( 1 â ' Î ) the parameter Î 1\/4 lies in the confidence interval . '' We only know that by repetition in 100 ( 1 â ' Î ) % of the cases Î 1\/4 will be in the calculated interval .
Simplified: Either Î 1\/4 is in this interval or is n't .