7. Suppose that you plot the residuals for your sample against independent variable x and get residuals You should conclude that the data are A. definitely heteroskedastic. B. likely homoscedastic. C. possibly heteroskedastic and you would perform a formal test for heteroskedasticity. D. possibly homoscedastic and you would perform a correction for homoscedasticity. 8. A stationary time-series is one for which A. the probability of distribution of the dependent variable changes over time. B. the probability of distribution of the dependent variable does not change over time. C. the probability of distribution of the independent variables changes over time. D. the probability of distribution of the independent variables does not change over time