Method and apparatus for calculating confidence intervals

A portion of the disclosure of this patent document contains material that is subject to copyright protection. The copyright owner has no objection to the facsimile production by any one of the patent disclosure, as it appears in the Patent and Trademark Office files or records, but otherwise reserves all copyrights rights whatsoever. An exemplary embodiment of the invention is a method and apparatus for calculating at least one confidence interval. The method comprises activating a calculator. The calculator prompts the user to enter at least three pairs of calibration data. The user then specifies a reference for the calibration data. The calculator then generates a list of the calibration data. The calculator then calculates a linear calibration curve derived from the calibration data. The calculator then calculates a residual calibration value plot derived from the calibration data. The user enters an unknown sample output measurement. The calculator calculates a back-calculated unknown sample input measurement. The calculator lastly calculates a confidence interval for the back-calculated unknown sample input measurement.