4. Two technicians have analyzed a standard with a known nitrate concentration of 25.0 mg/L. TH results are shown below. Trial 1 2 5 Results from Technician 1 (mg/mL) Results from Technician 2 (mg/mL) 23.8 23.4 23.2 23.4 22.9 23.6 Average: 23.4 30.1 22.4 27.5 21.3 Average: 24.9 Choose the statement below which is FALSE. a. Technician 2 has greater accuracy than technician 1. b. Technician 1 has greater precision than technician 2. c. Results from technician 1 have both systematic and random error. d. Results from technician 2 only have determinant error.
4. Two technicians have analyzed a standard with a known nitrate concentration of 25.0 mg/L. TH results are shown below. Trial 1 2 5 Results from Technician 1 (mg/mL) Results from Technician 2 (mg/mL) 23.8 23.4 23.2 23.4 22.9 23.6 Average: 23.4 30.1 22.4 27.5 21.3 Average: 24.9 Choose the statement below which is FALSE. a. Technician 2 has greater accuracy than technician 1. b. Technician 1 has greater precision than technician 2. c. Results from technician 1 have both systematic and random error. d. Results from technician 2 only have determinant error.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:4. Two technicians have analyzed a standard with a known nitrate concentration of 25.0 mg/L. The
results are shown below.
Results from Technician 1 (mg/mL) Results from Technician 2 (mg/mL)
23.4
23.8
TO 23.2
Trial
1
2
3
4
5
23.4
22.9
23.6
Average: 23.4
30.1
22.4
27.5
21.3
Average: 24.9
Choose the statement below which is FALSE.
a. Technician 2 has greater accuracy than technician 1.
b. Technician 1 has greater precision than technician 2.
c. Results from technician 1 have both systematic and random error.
d. Results from technician 2 only have determinant error.
Expert Solution
Step 1
Precision is a measure of how close the measured values are to each other and accuracy is a measure of how close the measured values are to the true value.
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