Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 1 - Module 3 - Scientific Method - AP Review Questions - Page 25: 2

Answer

(b) precise but not accurate

Work Step by Step

Because precision refers to the closeness of multiple measurements to each other, and the readings from device 1 are all between 415-417, the sensor is precise. But because accuracy is how close the measured value is to the true value, and the amount lead in the samples is known to be 400ppm, device 1 is not accurate.
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