A measured signal (y0) which can be interpolated in the calibration, the error in x 0:
M is the Slope
N is the number of measurements in calibration
A (y0) that you have measured a total ‘j’ time then the error in x:
By doing replicate measurements you decrease the overall error
Non- Excel Approach to Finding s_x0
You have a set of data on silver in lake water are told that for 7 calibration samples. The instrument response function was 35 mV/ppm; the standard error of the estimate or Sy/x is 120; the average signal was 300 mV; and the standard deviation of the concentrations in the calibration dataset was 140 ppm. You unknown sample gave a signal of 550 mV. Corresponding to a concentration of 15.7 ppm. Find Sx0 for this dataset.