QBA Exam 1 Practice Exam Que stions & Answers a variable used to describe, predict, and control the dependent variable - ANS-independent variable the difference between the observed value of the dependent variable and the corresponding predicted value of the dependent variable - ANS-residual a quantity that measures the amount of total variation in the observed values of y that is not explained by the predictor variable x - ANS-unexplained variation the variable that is being described, predicted, or controlled - ANS-dependent variable what is the appropriate symbol for the sample correlation coefficient? - ANS-r the difference between an individual value of the dependent variable and the corresponding mean value of the dependent variable - ANS-error term the point estimates of the slope an d y intercept of the simple linear regression model that minimize the sum of squared residuals - ANS-least squares point estimates a measure of the linear association between two variables - ANS-simple correlation coefficient the proportion of the total variation in the observed values of the dependent variable that is explained by the simple linear regression model - ANS-simple coefficient of determination the sum of squared differences between each observed value of the depe ndent variable and the sample mean of the dependent variable is - ANS-the total variation of the dependent variable
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