1) A residual scatterplot with fitted values on the horizontal axis has a clear positive linear trend. Which regression assumption does such a pattern cast doubt upon? Mean of zero Constant variance Normality Independence 2) A residual scatterplot with fitted values on the horizontal axis has vertical variation that increases from low on the left side of the plot to high on the right side of the plot. Which regression assumption does such a pattern cast doubt upon? Mean of zero Constant variance Normality Independence 3) A residual scatterplot with time order on the horizontal axis has points that seem to track one another more than would be expected by chance. Which regression assumption does such a pattern cast doubt upon? Mean of zero Constant variance Normality Independence 4) Which regression assumption is not generally assessed using a residual scatterplot? Mean of zero Constant variance Normality Independence 5) How do outliers stand out on a residual scatterplot? As isolated points on the far left or far right of the plot As isolated points at the top or bottom of the plot As isolated points anywhere on the edge of the plot