Problems4-1. What is the relation between the standard deviation andthe precision of a procedure? What is the relation betweenstandard deviation and accuracy?4-2. What fraction of observations in an ideal Gaussiandistribution lies within µ ±o? Within µ ± 20? Within ± 30?μ4-3. In Table 4-2, one set of measurements was repeated10 times and the other was repeated 4 times. If both had beenrepeated 10 times, would the standard deviations of 0.28 and0.47 mM be considered "significantly" different from eachother?69 Ga4-4. The ratio of the number of atoms of the isotopesand 71Ga in samples from different sources is listed here:oru moil (004.0) sunsSample pr69 Ga/71 Ga12341.526 601.529 741.525 921.527 31Sample5678(a) Find the mean value of 69Ga/7¹ Ga.(b) Find the standard deviation anddeviation.69 Ga/¹¹ Ga1.528 941.528 041.526 851.527 93dgiete boisrelative standard1.527 9306014800982 $80.0 34-9. Two methods were used to meas(units of enzyme activity per milligenzyme. One unit of enzyme activityof enzyme that catalyzes the formatiproduct per minute under specified cMethod12139148200Enzyme activit-14715900 (LGbu2 6 500 (EHIIs the mean value of method 1 signmean value of method 2 at the 95%4-10. Students measured the conction by various titrations in whicused to find the end point.Meaconcent(± standaIndicator1. Bromothymol blue0.095 652. Methyl red0.086 863. Bromocresol green0.086 41Data from D. T. Harvey, J. Chem. Edevi

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4-1. What is the relation between the standard deviation and the precision of a procedure? What is the relation between standard deviation and accuracy?

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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Question

Problems
4-1. What is the relation between the standard deviation and
the precision of a procedure? What is the relation between
standard deviation and accuracy?
4-2. What fraction of observations in an ideal Gaussian
distribution lies within µ ±o? Within µ ± 20? Within ± 30?
μ
4-3. In Table 4-2, one set of measurements was repeated
10 times and the other was repeated 4 times. If both had been
repeated 10 times, would the standard deviations of 0.28 and
0.47 mM be considered "significantly" different from each
other?
69 Ga
4-4. The ratio of the number of atoms of the isotopes
and 71Ga in samples from different sources is listed here:
oru moil (004.0) suns
Sample pr
69 Ga/71 Ga
1
2
3
4
1.526 60
1.529 74
1.525 92
1.527 31
Sample
5
6
7
8
(a) Find the mean value of 69Ga/7¹ Ga.
(b) Find the standard deviation and
deviation.
69 Ga/¹¹ Ga
1.528 94
1.528 04
1.526 85
1.527 93
dgiete bois
relative standard
1.527 93
06014800982 $80.0 3
4-9. Two methods were used to meas
(units of enzyme activity per millig
enzyme. One unit of enzyme activity
of enzyme that catalyzes the formati
product per minute under specified c
Method
1
2
139
148
200
Enzyme activit-
147
159
00 (LG
bu2 6 500 (EHI
Is the mean value of method 1 sign
mean value of method 2 at the 95%
4-10. Students measured the conc
tion by various titrations in whic
used to find the end point.
Mea
concent
(± standa
Indicator
1. Bromothymol blue
0.095 65
2. Methyl red
0.086 86
3. Bromocresol green
0.086 41
Data from D. T. Harvey, J. Chem. E
devi

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