N * Variance of population proportion = σP2 = PQ / n * Standardized score = Z = (X - μ) / σ * Population correlation coefficient = ρ = [ 1 / N ] * Σ { [ (Xi - μX) / σx ] * [ (Yi - μY) / σy ] } Statistics Unless otherwise noted‚ these formulas assume simple random sampling. * Sample mean = x = ( Σ xi ) / n * Sample standard deviation = s = sqrt [ Σ ( xi - x )2 / ( n - 1 ) ] * Sample variance = s2 = Σ ( xi - x )2 / ( n - 1 ) * Variance of sample proportion = sp2 = pq / (n
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JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS‚ VOLUME 1‚ NUMBER 3‚ SUMMER 2000 Comparison between TG-51 and TG-21: Calibration of photon and electron beams in water using cylindrical chambers S. H. Cho‚a) J. R. Lowenstein‚b) P. A. Balter‚c) N. H. Wells‚d) and W. F. Hansone) Department of Radiation Physics‚ The University of Texas M.D. Anderson Cancer Center‚ 1515 Holcombe Boulevard‚ Box 547‚ Houston‚ Texas 77030 ͑Received 31 March 2000; accepted for publication 8 June 2000͒ A new calibration
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Entity-Relationship Diagrams (ERD) Data models are tools used in analysis to describe the data requirements and assumptions in the system from a top-down perspective. They also set the stage for the design of databases later on in the SDLC. There are three basic elements in ER models: Entities are the "things" about which we seek information. Attributes are the data we collect about the entities. Relationships provide the structure needed to draw information from multiple entities. Generally
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E-R Diagram Introduction:- In 1976 ‚Chen developed the Entity-Relationship Diagrams ‚a high-level data model that is useful in developing a conceptual design for database . An ER diagram is a diagram containing entities or “items”‚ relationships among them‚ and attributes of the entities . The E-R model is one of the best known tools for logical database design. Within the database community‚ it is considered a natural and easy-to-understand way of conceptualizing the structure of database.
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Formulas (to differential equations) Math. A3‚ Midterm Test I. sin2 x + cos2 x = 1 sin(x ± y) = sin x cos y ± cos x sin y tan(x ± y) = tan x±tan y 1∓tan x·tan y differentiation rules: (cu) = cu ′ ′ ′ ′ ′ (c is constant) cos(x ± y) = cos x cos y ∓ sin x sin y (u + v) = u + v (uv)′ = u′ v + uv ′ ′ ′ u ′ = u v−uv v v2 df dg d dx f (g(x)) = dg dx sin 2x = 2 sin x cos x tan 2x = sin x = 2 cos 2x = cos2 x − sin2 x 2 tan x 1−tan2 x 1−cos 2x ‚ 2 integration rules: cos x = 2
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Physics Equations and Formulas By Steven Holzner Part of the Physics I For Dummies Cheat Sheet Physics is filled with equations and formulas that deal with angular motion‚ Carnot engines‚ fluids‚ forces‚ moments of inertia‚ linear motion‚ simple harmonic motion‚ thermodynamics‚ and work and energy. Here’s a list of some important physics formulas and equations to keep on hand — arranged by topic — so you don’t have to go searching to find them. Angular motion Equations of angular motion are
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Executive Summary Overview The purpose of the Stonebrook Resort Survey Project (SRSP) is to improve the current guest satisfaction survey process. The scope of the project is to improve the way the guest survey responses are captured‚ stored and tracked. Additionally‚ it will help the Marketing department identify “happy” guests in order to provide these guests with resort promotions. The purposed solution is to install the Survey Management Application (SMA) on hotel computers. This program
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Project #1 Mech 4336 Principles of Engineering Design Group #10 Gilbert Paquian Rogelio Grisanti Jorge Serrano Ricardo Mejia Gus Martinez Introduction: The first project of the semester is the design and analysis of a pair of pliers‚ these pliers are to have the ability to tighten/untighten nuts or bolts‚ and cut through wires. Group 10 is to make a design for these pliers‚ make a 3D cad model on a design software package. The group is then to perform a series of analysis that include:
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The Entity Relationship Diagram (ERD) depicts a conceptual data model that incorporates some of the important scientific information about the real world. It adopts a natural view that the real world consists of entities and relations (Chen‚ 1976). One objective of the ERD is to create a simple‚ easy to understand and conveniently presented data model consisting of entities‚ attributes‚ relationships and cardinalities. The model serves as tool for database design‚ where the model can facilitate communication
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Before starting this homework assignment‚ please review the AIB simulation in this week’s Lecture. This simulation will provide you with an understanding of how to create a network diagram‚ and how to do a forward and backward pass to determine the ES‚ LS‚ EF‚ LF and slack (float). You will also learn how to determine the duration of the project‚ and the critical path. In this homework assignment‚ you will be working through four Activity In Box (AIB) problems. Using the activity‚ duration‚ and
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