Holmium oxide can be used for this process in UV-Vis spectroscopy apparatuses. If a spectrometer appears to give poor results in this process, one can conduct a matrix spike experiment to “recover” the results. An example of this process involves adding aliquots of a known concentration to a sample, then extrapolating to find the negative x-intercept; that process is the method of (*) standard addition. This type of sensitivity divided by the standard deviation of a signal gives analytical sensitivity. In a Beer’s Law experiment, this process involves generating an absorbance-concentration curve for known standards, which can then be used to interpolate an unknown concentration based on its signal. For 10 points, name this process (10[1])of quantifying the relationship between analytical variables and validating the accuracy of an instrument. (10[1])■END■ (10[2])