Exam 1 Key - Name:_ Chemistry 3600 Fall, 2003 First...

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Chemistry 3600 Fall, 2003 First Examination October 3, 2003 Read over all the questions before you start to answer, as some are more difficult than others. Each question shows the number of points that it is worth in parenthesis. Show the formulas you used and all your work to get full credit. Express all answers with the correct number of sigfigs! Formulas : For F calc >F table For F calc <F table Tables : Q table @ 90% confidence: Q 0.94 0.74 0.64 0.56 0.51 0.47 0.44 0.41 N 3 4 5 6 7 8 9 10 t table @ 95% confidence: t 12.71 4.30 3.18 2.78 2.57 2.45 2.36 2.31 2.26 d.f. 1 2 3 4 5 6 7 8 9 F table @ 95% confidence: 1) List the steps involved in a chemical analysis (10) Formulate the Question/Research Design a Procedure/Research Sampling Sample Preparation Analytical Method/Analysis Data Analysis/Interpretation Conclusions/Final Report d.f. ( s 2 ) d.f. ( s 1 ) 2 3 4 5 6 2 19.00 19.16 19.25 19.30 19.33 3 9.55 9.28 9.12 9.01 8.94 4 6.94 6.59 6.39 6.26 6.16 5 5.79 5.41 5.19 5.05 4.95 6 5.14 4.76 4.53 4.39 4.28 n x i i = x 1 - ) ( 2 n x x s i i = n ts x μ ± = 2 1 2 1 pooled 2 1 calculated n n n n s x x t + = 2 ) 1 ( ) 1 ( s 2 1 2 2 2 1 2 1 pooled + + = n n n s n s 2 2 2 1 2 1 2 1 calculated / / n s n s x x t + = 2 - 1 ) / ( 1 ) / ( ) / / ( 2
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This note was uploaded on 12/10/2008 for the course CHEMISTRY CHEM 3600 taught by Professor Philipj.silva during the Fall '07 term at Uni. Tartu.

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Exam 1 Key - Name:_ Chemistry 3600 Fall, 2003 First...

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