 # Mathematics - Stack Exchange

Mathematics Books Online General Elementary Algebra & Trigonometry Abstract Algebra Mathematical Analysis & Calculus Differential Equations Linear Algebra Geometry & Topology Mathematical Logic Category Theory Number Theory Probability & Statistics Computational Mathematics Applied Mathematics & Mathematical Physics History of Mathematics & Popular Books Algebraic and Geometric Methods in Enumerative Combinatoricsby Federico Ardila, 2014, 143 pp, 1.8MB, PDF Analytic Combinatoricsby Philippe Flajolet, Robert Sedgewick, 2008, 822 pages, 9.8MB Applied Discrete Structuresby Al Doerr, Ken Levasseur, 2013, 496 pp, multiple PDF files Assessing Mathematical Proficiencyby Alan H. Combinatorial Theory: Hyperplane Arrangementsby Richard Stanley, 2004, PDF Combinatorics Through Guided Discoveryby Kenneth P. Contemporary Issues in Mathematics Educationedited by Estela A. Discrepancy Theoryby William Chen, 2012, 99 pp, 960KB, PDF Discrete MathematicsWikibooks, 2012 Discrete Structuresby Vladlen Koltun, 2008, 89 pp, 420KB, PDF

Statistics Problems With Solutions Problem 1 In one state, 52% of the voters are Republicans, and 48% are Democrats. In a second state, 47% of the voters are Republicans, and 53% are Democrats. Suppose a simple random sample of 100 voters are surveyed from each state. What is the probability that the survey will show a greater percentage of Republican voters in the second state than in the first state? Solution The correct answer is C. The solution involves four steps. Make sure the sample size is big enough to model differences with a normal population. Therefore, the probability that the survey will show a greater percentage of Republican voters in the second state than in the first state is 0.24.

MIND Research Institute Matematicas Visuales | Home In MatematicasVisuales you will find visual expositions of mathematical concepts. MatematicasVisuales intends to complement the work initiated by artiludios, a site with games, puzzles and mathematical curiosities. Reading Miguel de Guzmán I found a demonstration of the line of Simpson and the Steiner Deltoid. The concept of function and its graphical representation are a key concept and we dedicate special attention to it in the analysis section. Geometric representation of the complex numbers facilitates its visualization. Thinking in who have to start learning probability we have this section about this subject. In the history section we approach mathematics through its history. Miguel Cardil made the design of matematicasvisuales.com. The contents of MatematicasVisuales has been developed by Roberto Cardil.

BetterExplained | Friendly lessons for lasting insight. PlanetMath Free Trigonometry Practice Tests Our completely free Trigonometry practice tests are the perfect way to brush up your skills. Take one of our many Trigonometry practice tests for a run-through of commonly asked questions. You will receive incredibly detailed scoring results at the end of your Trigonometry practice test to help you identify your strengths and weaknesses. Pick one of our Trigonometry practice tests now and begin! High school Trigonometry classes introduce students to various trigonometric identities, properties, and functions in detail. Like Pre-Algebra, Algebra I, and Algebra II classes, Trigonometry classes focus on functions and graphs. Trigonometric identities are also discussed in Trigonometry classes; students learn about the sum and product identities, as well as identities of inverse operations, squared trigonometric functions, halved angles, and doubled angles. Another major part of Trigonometry is learning to analyze specific kinds of special triangles.