Stats 303 Chapter 14 Assignment PDF

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Chapter 14 practice problems...

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Chapter 14  

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The multiple coefficient of determination is the _______ divided by the total variation. o Explained variation The graph of the prediction equation obtained from the model

is a(n) __________ o Plane The assumption of independent error terms in regression analysis is often violated when using time-series data. o True In a regression model, at any given combination of values of the independent variables, the population of potential error terms is assumed to have an F distribution. o False The multiple _________ measures the proportion of the variation in y (response variable) explained by the multiple regression model or the set of independent variables included in the multiple regression equation. o Coefficient of determination Which one of the following is not an assumption about the residuals in a regression model? o Variance of zero Assumptions of a regression model can be evaluated by plotting and analyzing the ____________. o Error terms R is defined as: o Explained variation/total variation In multiple regression analysis, the explained sum of squares divided by the total sum of squares yields the __________. o R^2 The error term in the regression model describes the effects of all factors other than the independent variables on y(response variable). o True The mean square error of a multiple regression model with k independent variables and n observations is o SSE/[n - (k + 1)] Which of the following is not an assumption of the multiple linear regression model? o The level of measurement of the data for the dependent variable is at least ordinal. The multiple correlation coefficient can assume any value between zero and 1, inclusive. o False Regression models that employ more than one independent variable are referred to as multiple regression models. o True In a regression model, a value of the error term depends upon other values of the error term. o False The range of feasible values for the multiple coefficient of determination is from ________. o 0 to 1 For a given multiple regression model with three independent variables, the value of the adjusted multiple coefficient of determination is _________ less than R . o Always In multiple regression analysis, which one of the following is the appropriate notation for error (residual)? 2

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 o Option B The y-intercept (β ) in a multiple regression model represents the estimated value of the __________ variable, when the value of all independent variables are _________. o Response, zero  The ____________ term describes the effects on y of all factors other than the independent variables in a multiple regression model. o Error In regression analysis, the standard error (s) is _________ greater than the standard deviation of y (the dependent variable).  Never When using a multiple regression model, we assume that error terms (residuals) are distributed according to a(n) ________________ distribution.  normal 

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