Which of the following statements concerning calibration curves are true? 1. A plot of signal versus analyte amount or concentration  2. Measure the response of an instrument by first measuring the response from a standard  3. Used to calibrate a measurement over an extended range.   a. 1 only b. 1 an 2 only c. 1 and 3 only d. 2 and 3 only e. 1, 2, and 3

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