Determining the Absorbance Maximum Wavelength and Molar Extinction Coefficient to Find the Molarity of the Unknown DCPIP Background Information: A spectrophotometer is an instrument used to help determine the absorption spectrum of chemicals. It does this by reading the absorbance of the chemical at different wavelengths. All chemicals absorb light in their own distinct way. This distinction helps to identify unknown chemicals. The absorption of light within a chemical is also very important because
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Cause and Correlation Vergia Wallace PSY/285 March 8‚ 2013 Dr. Elizabeth Brook Morford The difference between causation and correlation is extremely significant in systematic thought. These two notions get confused with one another whether it is a misinterpretation or having the aspiration to provide a reasonable description for scientific observations. As a result it is critical to have the understanding of the difference between the two concepts. In this writing I will compare and contrast
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HOME ASSIGNMENT Analysis of Auto Parts Industry/ USA /deviations‚ betas and correlations/ Module: Financial Markets Module leader: Prof. György Komáromi Written by László Földvári Industry Analysis I have choosen five companies from the Capital Goods sector / Autoparts Industry/ Nasdaq. The industry analysis is the essence and first step of getting a clearer view of the market players. We have to know the most important macroeconomical circumstances of industry as well. In
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between 2+ variables * correlation studies measure variables; NOT manipulate: 1. Measure one variable (X) 2. Measure second variably (Y) 3. Statistically determine if X & Y are related (X Y) * BIDIRECTIONALITY PROBLEM: X Y‚ X Y‚ or X Y * THIRD VARIABLE PROBLEM: X Z Y * determines if association between variables exists * cannot draw causal conclusions * CORRELATION COEFFICIENT:
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Linear regression and correlation In linear regression‚ you should follows those instructions: 1. Choose one pair variables‚ first create the scatterplot (using Excel). Do this by simply plotting one variable as the x –axis and the other y-axis. Based on the scatterplot‚ comment on the relationship after fitting a simple curve‚ so you can be creative in pairing the variables. 2. Find the linear regression model by computing either manually or using Excel. 3. Compute the correlation
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Coefficient of variation Sample-> CY=s/x 1. A relative measure of dispersion 2. Adjusts for differences in magnitudes of the means. 3. Does not have units of measure 4. Allows for direct comparisons of mean-adjusted dispersion across different data sets. Percentiles and quartiles Coefficient of determination The proportion of variation in the dependent variable ”explained” by the independent variable. 因變量的變化的比例“解釋”的獨立變量。 (Correlation coefficient)^2=r^2 R=0.90 (0
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Laboratory Coefficients of Friction Discussion: Friction is the force that resists motion and can be determined in either static situations or kinetic situations using the following equation: [pic] Static friction is the amount of friction that resists the start of motion and kinetic friction resists an object’s continued motion. The coefficient of friction depends on a number of factors including surface area and the types of surfaces in contact. The only way to determine a coefficient of friction
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Coefficient of Friction- Post Lab Abstract The purpose of the experiment was to determine to coefficient of friction on a block sliding across a horizontal plane‚ and on the same block sliding down an inclined plane. This was done by first testing block‚ and how much weight on a string was needed to move the block at a constant velocity using a pulley system. The block weighed 0.2385 kilograms‚ and needed a hanging mass of 0.05 kg to move at a constant velocity. This means the coefficient of
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Homework 1 Due Monday‚ September 17th at the beginning of class. Show your work. 1. Match the differential equation in (a)-(c) to a family of solutions in (d)-(f). The point of this exercise is not to solve the differential equations in a) - c). (a) y = y 2 (b) y = 1 + y 2 (c) yy = 3x (d) y = tan(x + C) (e) 3x2 − y 2 = C (f) y = −1/(x + C) 2. Find the value of k so that y = e3t + ke2t is a solution of y − 2y − 3y = 3e2t . 3. Solve the following differential equations and IVP’s. You may solve these
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Measuring the Absorption Coefficient for Some Common Materials Used in Functional Rooms through Standing Wave Ratio Adonis Cabigon1‚ Alaiza Tangaha2 Department of Physics‚ University of San Carlos‚ Nasipit‚ Talamban‚ Cebu City 6000 1adoniscc@yahoo.com 2mayalaiza92@yahoo.com Abstract In this paper‚ we present the measurement of the absorption coefficient α of MDF (Medium Density Fiberboard) and Fiber Cement through an improvised standing wave apparatus consist of an enclosed tube with
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