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Exam 1 Key - Name Chemistry 3600 Fall 2003 First...

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Name:________________________________________________________________________ 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 2 2 2 2 1 2 1 2 1 2 2 2 2 1 2 1
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