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Homework 3 – Chemistry 2001, Spring 2008
This is due Monday, February 11, 2008 (Lecture 6)
DO NOT TURN IN THIS SHEET
PLEASE MAKE SURE THAT YOU PLACE YOUR STUDY GROUP NAME ON YOUR
WORK
31.
What is the relationship between the standard deviation and the precision of a procedure?
What is the relation between standard deviation and accuracy?
32.
What fraction of observations in an ideal Gaussian distribution lie within μ ± σ?
Within
μ ± 2σ?
Within μ ± 3σ?
33.
What is the meaning of confidence interval?
34.
For the numbers 116.0, 97.9, 116.2, 108.8, and 108.3, find the mean, standard deviation,
and 90% confidence interval for the mean.
35.
The calcium content of a mineral was analyzed five times by each of two methods.
Are
the mean values significantly different at the 95% confidence level?
Method
Ca (wt %)
1
0.027 1
0.028 9
0.027 9
0.027 0
0.027 2
2
0.027 1
0.026 8
0.026 3
0.027 4
0.026 9
36.
Students at the University of Southern Mississippi measured visible light absorbance of
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This note was uploaded on 11/12/2011 for the course CHEM 2001 taught by Professor Staff during the Fall '08 term at LSU.
 Fall '08
 Staff
 Chemistry

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