Quant Exam 1 2004 Answers - Name Chemistry 3600 Fall 2004...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
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 2 2 1 s s F = range gap Q = s n t calc ) - x ( μ = 2 3 2 2 2 1 4 ) / ( e e e e + + = - + 2 3 2 2 2 1 4 ) (% ) (% ) (% % ) / ( e e e e + + = ÷ × [ ] [ ] s A F x A s x = [ ] [ ] [ ] x s x I I X S X + = + f f i
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
y = 1177.5 (± 19.3) x + 330.55 (± 12.4) R 2 = 0.990 -500 0 500 1000 1500 2000 2500 -0.5 -0.4 -0.3 -0.2 -0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 Concentration added to unknown ([M]) Signal (Arbitrary units) 4 6.94
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern