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Homework 3 SP 2008

Homework 3 SP 2008 - Homework 3 Chemistry 2001 Spring 2008...

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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 3-1. What is the relationship between the standard deviation and the precision of a procedure? What is the relation between standard deviation and accuracy? 3-2. What fraction of observations in an ideal Gaussian distribution lie within μ ± σ? Within μ ± 2σ? Within μ ± 3σ? 3-3. What is the meaning of confidence interval? 3-4. 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. 3-5. 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 3-6. Students at the University of Southern Mississippi measured visible light absorbance of various food colorings. Replicate measurements of the absorbance of a solution of the drink Kool-Aid at a wavelength of 495 nm gave the following values:
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