A scientist is about to collect data to compute a 95% confidence interval, but he is unsure of what a 95% confidence interval really means. Help him out by filling in the blanks. Before a sample is chosen, there is a 95% ______________ that the sample will produce an interval containing the true mean value. After a sample has been chosen, there is 95% ________________ that the interval produced by the sample will contain the true mean value.