Answer :
Final answer:
An environmental technician tested a hydrogen sulfide meter with a calibration gas of 100 ppm. Given the meter readings ranging from 74 ppm to 129 ppm, these results indicate the meter is neither accurate (close to known value) nor precise (consistent in readings). Hence, the correct answer is 'The technician concludes the meter is neither accurate nor precise.'
Explanation:
An environmental technician is utilising a hydrogen sulfide meter that needs calibration with a calibration gas of 100 ppm (parts per million) concentration. Calibration samples gathered in this scenario are 115 ppm, 89 ppm, 129 ppm, and 74 ppm. If we compare these values with the known concentration of 100 ppm of the calibration gas, it is evident that the meter is neither accurate nor precise.
Accuracy refers to how close a measured value is to the true or known value, which in this case is 100 ppm. Yet, none of the calibration sample values are close to this, meaning the meter is inaccurate. Precision, on the other hand, refers to the consistency of the measured values, implying calibration samples should be close to each other in value. Given the wide range between 74 ppm and 129 ppm in our results, the meter is also imprecise.
In conclusion, considering the definitions and the given data, the most accurate choice would be option C: The technician concludes the meter is neither accurate nor precise.
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