Two students determine the percentage of lead in a sampleas a laboratory exercise. The true percentage is 22.52%. Thestudents’ results for three determinations are as follows:(1) 22.52, 22.48, 22.54(2) 22.64, 22.58, 22.62(a) Calculate the average percentage for each set of data andstate which set is the more accurate based on the average.(b) Precision can be judged by examining the average of thedeviations from the average value for that data set. (Calculatethe average value for each data set; then calculate the averagevalue of the absolute deviations of each measurementfrom the average.) Which set is more precise?
Two students determine the percentage of lead in a sampleas a laboratory exercise. The true percentage is 22.52%. Thestudents’ results for three determinations are as follows:(1) 22.52, 22.48, 22.54(2) 22.64, 22.58, 22.62(a) Calculate the average percentage for each set of data andstate which set is the more accurate based on the average.(b) Precision can be judged by examining the average of thedeviations from the average value for that data set. (Calculatethe average value for each data set; then calculate the averagevalue of the absolute deviations of each measurementfrom the average.) Which set is more precise?
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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Two students determine the percentage of lead in a sample
as a laboratory exercise. The true percentage is 22.52%. The
students’ results for three determinations are as follows:
(1) 22.52, 22.48, 22.54
(2) 22.64, 22.58, 22.62
(a) Calculate the average percentage for each set of data and
state which set is the more accurate based on the average.
(b) Precision can be judged by examining the average of the
deviations from the average value for that data set. (Calculate
the average value for each data set; then calculate the average
value of the absolute deviations of each measurement
from the average.) Which set is more precise?
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