Introduction to Linear Regression and Correlation Analysis Goals After this‚ you should be able to: • • • • • Calculate and interpret the simple correlation between two variables Determine whether the correlation is significant Calculate and interpret the simple linear regression equation for a set of data Understand the assumptions behind regression analysis Determine whether a regression model is significant Goals (continued) After this‚ you should be able to: • Calculate and
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Accounting Equations Paper ACC/300 Nakisha Susberry University of Phoenix Student 4/20/2013 The accounting equation is a formula that represents the relationship between the assets‚ liabilities‚ and owner ’s equity of a small business. Businesses use this to basically show what it owns what it owes and what its investors are investing. In order to understand these concepts it is important to have some knowledge of what is meant by each of the three basic components mentioned. “Assets
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CHAPTER 4 – THE BASIS OF STATISTICAL TESTING * samples and populations * population – everyone in a specified target group rather than a specific region * sample – a selection of individuals from the population * sampling * simple random sampling – identify all the people in the target population and then randomly select the number that you need for your research * extremely difficult‚ time-consuming‚ expensive * cluster sampling – identify
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Why It Couldn’t Be The short story Cold Equations by Tom Godwin takes place on a ship called EDS. The space cruiser is piloted by a man named Barton. He has an order of killing the stowaway who snuck onto the ship because the weight on the EDS is too much for the ship to handle. In the process of hunting down the stowaway‚ he realizes it was a young innocent girl named Marilyn. Once Barton understands what kind of person Marilyn is‚ he doesn’t kill her immediately because he knows her reasons were
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Accounting Equation ACC 300 June 24‚ 2013 Bennie Clark Accounting Equation Assets = Liabilities + Stockholder’s Equity is the basic accounting equation. Liabilities are a company’s legal debts or obligations that come from transactions or from business operations. Stockholder’s equity is capital received from investors in exchange for stock‚ retained earnings and donated capital. These two portions of the balance sheet added together make up the company’s assets‚ which represent ownership
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If the lines ran parallel I would not have an intercept point. Y=x+330 Slope intercept form. (1)y=(1)+330(1) Multiply by 1. Y=-3x+330 Y+3x=3x+3≤330 add 3. 3x+y ≤330 or 3x+y-330≤0 This is the linear inequality for my line. Now that I know what Y is I can solve the other linear equations. The next problem asks will the truck hold 71 refrigerators and 118 TVs. I need to determine if the test points (71‚ 118) are within the shaded region of my graph. x=71 y=118 3(71)+118≤330 213+118≤330
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these properties are fundamentally important to our understanding of more advanced concepts (tangents‚ slopes‚ derivatives). Skills described in this introductory material will be required in many contexts. 1.1 Geometric ideas: lines‚ slopes‚ equations Straight lines have some important geometric properties‚ namely: The slope of a straight line is the same everywhere along its length. Definition: slope of a straight line: y ∆y ∆x x Figure 1.1: The slope of a line (usually given the symbol
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reasonable straight-line fit to the points confirms that the chosen model and the data are consistent. Advantages of Cum Hazard Plotting 1. It is much easier to calculate plotting positions for multicensored data using cum hazard plotting techniques. 2. Linear graph paper can be used for exponential data and log-log paper can be used for Weibull data. Disadvantages of Cum Hazard Plotting 1. Commercial Cum Hazard paper may be difficult to find. 2. It is less intuitively clear just what is being plotted.
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Graphical Techniques to describe a set of Interval data ( cross-sectional data ) A. Histogram ~ A histogram is created by drawing rectangles whose bases are the class intervals (classes) and and whose heights are the frequencies. Determining number of class intervals No. of Observations No. of Classes 50‚000 17 - 20 ~ Alternatively using Sturges’s formula No. of class intervals = 1 + 3.3 log(n) where n = No. of observations ~ Determining class interval widths Class width = (Largest Observation
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truck hold 71 refrigerators and 118 TVs or will the truck hold 51 refrigerators and 176 TVs? The book shows a graphing points at (0‚330) and (110‚0). m=y‚ -y =330-0=330=-3 x ‚-x 0-110 -110 This is the first slope is -3. Now we can form a linear equation to write. y‚-y =( x-x) slope point y-330=-3(x-0) y-330=-3x we simplify the parenthesis y=-3x+330 add 330 to each side 3x+y<330 add 3x to each side The graph is a solid line rather than a dashed line indicating that points on the line itself
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