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QNT 275 WEEK 4 QUIZ
Download 1 - For a given set of explanatory variables, in general: a confidence interval is narrower than a prediction interval. a confidence interval is wider than a prediction interval. The width of a confidence interval cannot be determined. the width of a confidence interval is the same as the width of a prediction interval. 2- The standard error of the estimate measures: the variability of the observed y-values around the predicted y-values. the variability of the predicted y-values around the mean of the observed y-values. the variability of the values of the sample regression coefficients. the variability of the explanatory variables. 3- In a simple linear regression model, if the plots on a scatter diagram lie on a straight line, what is the standard error of the estimate? +1 -1 Infinity 0 4- Which of the following variables is not qualitative? Gender of a person Religious affiliation Student's status (freshman, sophomore, etc.) Number of dependents claimed on a tax return 5- Consider the following simple linear regression model: The response variable is: β0 x y ε 6- Another name for an explanatory variable is the ___. descriptive variable independent variable inferred variable dependent variable 7- Serial correlation is typically observed in: outliers. sparse data. cross-sectional data. time series data. 8- Consider the following simple linear regression model: β0 and β1 are:
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the unknown parameters. the random error terms. the response variables. the explanatory variables.
9 - What is the name of the variable that's used to predict another variable? Coefficient of Determination Standard Error of the Estimate Response Explanatory
10- Which of the following violates the assumptions of regression analysis? The error term has a constant variance. The error term has a zero mean. The error term is normally distributed. The error term is correlated with an explanatory variable.