Classify the statements based on whether they describe the method of standard addition, internal standards, or external standards. standard addition internal standards external standards answer bank it is the method of choice when the matrix of the sample may affect the signal known quantities of the analyse are added to the unknown a known amount of a standard, different from the analyte, is added to the unknown. it consists of a series of standard analyte solutions separate from the unknown it is the method of choice when the instrument response or amount of sample analyzed varies from run to run it is used to meure the instrument responses a function of a known analyte concentration under a set of conditions