Exam_1_2010_practice (9) - Quantitative Analysis Chemistry...

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Quantitative Analysis Chemistry 222 Practice Exam (representative of the previously given) You have 50 minutes to complete this exam. It is a closed book exam; only calculators are allowed. Watch for significant figures. Show work, partial credit will be given. Showing just a numerical answer to any of the problems is not sufficient to qualify for the problem pass. Print Name_________________________________ Signature________________________________________________
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Problem #1 The following set of masses (mg) was obtained: 13.7; 14.4; 16.0; 13.6; 14.9; 14.2 a) Decide if the most suspect result can be rejected at the confidence level of 95%. b) Calculate (and show) the mean, the standard deviation (SD), the relative standard deviation in % (RSD), and the standard error. c) Show the confidence interval for the data at the confidence level of 95%.
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Problem #2 The mean lifetime of lightbulbs produced at a certain factory is 14,000 hours. The standard deviation for the lifetime distribution is 1,000 hours. Assume that losers are those who
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This note was uploaded on 12/28/2010 for the course CHEMISTRY 222 taught by Professor Wieckowski during the Spring '10 term at University of Illinois at Urbana–Champaign.

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Exam_1_2010_practice (9) - Quantitative Analysis Chemistry...

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