Practice Problem 2.2ANALYTICAL CHEMISTRY1. A chemist working in a hospital clinical laboratory obtained the following values foruric acid in blood serum: 4.63, 4.58, 4.72, 4.21, 4.67 and 4.65 %. (a) Use the 95%confidence level to test any dubious values. What value should be reported as the b)mean? c) sd? d) CV?2. Quantitative analysis student Analytical analyzed an ore sample for its lead contentand obtained a mean of 4.75% Pb for five measurements. If the certified true value is4.50%, what is the (a) percent error? (b) percent accuracy?3. Identify the data set with the highest (a) precision and (b) accuracy.Data setMeanPercent ErrorCertified truevalueStandarddeviation10.5000.4440.0411.001.330.25350.0045.200.041100.099.13.22COLLEGE OF SCIENCENM423Click to add notesP

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1. A chemist working in a hospital clinical laboratory obtained the following values for uric acid in blood serum: 4.63, 4.58, 4.72, 4.21, 4.67 and 4.65 %. (a) Use the 95% confidence level to test any dubious values. What value should be reported as the b) mean? c) sd? d) CV?

1. A chemist working in a hospital clinical laboratory obtained the following values for uric acid in blood serum: 4.63, 4.58, 4.72, 4.21, 4.67 and 4.65 %. (a) Use the 95% confidence level to test any dubious values. What value should be reported as the b) mean? c) sd? d) CV?

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.12QAP

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Question

Practice Problem 2.2
ANALYTICAL CHEMISTRY
1. A chemist working in a hospital clinical laboratory obtained the following values for
uric acid in blood serum: 4.63, 4.58, 4.72, 4.21, 4.67 and 4.65 %. (a) Use the 95%
confidence level to test any dubious values. What value should be reported as the b)
mean? c) sd? d) CV?
2. Quantitative analysis student Analytical analyzed an ore sample for its lead content
and obtained a mean of 4.75% Pb for five measurements. If the certified true value is
4.50%, what is the (a) percent error? (b) percent accuracy?
3. Identify the data set with the highest (a) precision and (b) accuracy.
Data set
Mean
Percent Error
Certified true
value
Standard
deviation
1
0.500
0.444
0.041
1.00
1.33
0.253
50.00
45.20
0.041
100.0
99.1
3.22
COLLEGE OF SCIENCE
NM4
2
3
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