Alevel 0.95 confidence interval is: a range of values with margin of error ± 0.95, which is also correct 95% of the time. any interval with margin of error ± 0.95. a range of values computed from sample data that will contain the true value of the parameter of interest 95% of the time. a range of values computed from sample data by a method that guarantees that the probability the interval computed contains the parameter of interest is 0.95.