Quant Exam 1 2004 Answers

Quant Exam 1 2004 Answers - Name:_ Chemistry 3600 Fall,...

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Name:________________________________________________________________________ Chemistry 3600 Fall, 2004 First Examination September 27, 2004 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 : t-tests Comparing to known value: Comparing two means: For F calc >F table For F calc <F table Tables : Q table 99% 0.99 4 0.92 6 0.82 1 0.74 0 0.68 0 0.63 4 0.59 8 0.56 8 0.47 5 0.42 5 0.393 95% 0.97 0 0.82 9 0.71 0 0.62 5 0.56 8 0.52 6 0.49 3 0.46 6 0.38 4 0.34 2 0.317 90% 0.94 1 0.76 5 0.64 2 0.56 0 0.50 7 0.46 8 0.43 7 0.41 2 0.33 8 0.30 0 0.277 N 3 4 5 6 7 8 9 10 15 20 25 t table 99 % 63.6 6 9.9 2 5.8 4 4.6 0 4.0 3 3.7 1 3.5 0 3.3 6 3.2 5 3.1 7 2.9 5 2.8 4 2.79 95 % 12.7 1 4.3 0 3.1 8 2.7 8 2.5 7 2.4 5 2.3 6 2.3 1 2.2 6 2.2 3 2.1 3 2.0 9 2.06 90 % 6.31 2.9 2 2.3 5 2.1 3 2.0 1 1.9 4 1.9 0 1.8 6 1.8 3 1.8 1 1.7 5 1.7 2 1.71 d.f. 1 2 3 4 5 6 7 8 9 10 15 20 25 F table @ 95% confidence: d.f. ( s 2 ) deg.free. ( s 1 ) 2 3 4 5 6 7 8 9 2 19.0 19.2 19.3 19.3 19.3 19.4 19.4 19.4 3 9.55 9.28 9.12 9.01 8.94 8.89 8.84 8.81 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 + + + + = n n s n n s n s n s d.f. 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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Quant Exam 1 2004 Answers - Name:_ Chemistry 3600 Fall,...

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