Visual Analysis: Confirm the statistical evidence with histogram shapes. The distribution shape may be judged by looking at the histogram or by comparing the mean and median. In symmetric data, the mean and median are about the same. When the data are skewed right (positively skewed), the mean exceeds the median. When the data are skewed left (or negatively skewed) the mean is below the median Use box plots to visualize quartile spreads and detect outliers