17, Base your answers to the next three questions on the table shown below. (2 p

Question

17, Base your answers to the next three questions on the table shown below. (2 pts each Method A Method MethodC Slope of calibration curve (mAun/ppm) Y-intercept of calibration curve (mAU s) R2 of (linear) calibration curve % recovery of check standard Concentration of check std. (ppm) ±l ass 0019 0 9996 1046 3.25 485 0.043 a022 0S8850.9973 90.5 988 98.8 9.05±0.07 9SSt003 1046,004 standard deviation A. Which method is the most accurate? Write A, B, or C in the small box and brielly explain B. Which method is the most precise? Write A, B, or C in the small box and briefly eplain C. Which method is the most sensitive? Write A, B, or C in the small box and briefly esplain

Explanation / Answer

Answer.

1) The most accurate method will give the nearest measurment result to a standard, therefore, method B is the most accurate.

2) Precision is the measure of how good the calibration curve fits the datapoints (it is proportional to the R2 value). Therefore, the method C is the most precise.

3) The slope of a calibration curve represents sensitivity.The greatest slope gives the method B, therefore, it is the most sensitive.

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