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Econometrics

Ch 12 Test written for Practice of Statistic (Starnes,Yatess and Moore) 4th ed.

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Chapter 12 Test name_________________ Honors Statistics 1. Which of the following would provide evidence that inference procedures for linear regression would be safe to use?? ?A. The scatterplot of the original data displays a nonlinear relationship between the explanatory variable and the response variable. ?B. A scatterplot of the residuals against the values of the explanatory variable displays a random scattering of points about the regression line, with roughly constant variation about the line as we move from left to right. ?C. A stem-and-leaf plot of the residuals displays a clearly skewed distribution. For questions 2-4

Chapter 19 Answer Key

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Chapter 19 Confidence Intervals for Proportions 339 Chapter 19 ? Confidence Intervals for Proportions 1. Margin of error. He believes the true proportion of voters with a certain opinion is within 4% of his estimate, with some degree of confidence, perhaps 95% confidence. 2. Margin of error. He believes the true percentage of children who are exposed to lead-base paint is within 3% of his estimate, with some degree of confidence, perhaps 95% confidence. 3. Conditions. a) Population ? all cars; sample ? 134 cars actually stopped at the checkpoint; p ? proportion of all cars with safety problems; p? ? proportion of cars in the sample that actually have safety problems (10.4%). Plausible Independence condition: There is no reason to believe that the safety problems

Linear Regression

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Linear Regression Linear regression attempts to model the relationship between two variables by fitting a linear equation to observed data. One variable is considered to be an explanatory variable, and the other is considered to be a dependent variable. For example, a modeler might want to relate the weights of individuals to their heights using a linear regression model.
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