1. Charts are better than frequency tables as summaries of the distribution of a categorical variable.
2. If all of the bars in a bar chart have the same length, then the categorical variable shown in the bar chart has no variation.
3. The frequency of a category is the dollar value of the observations in that group.
4. A relative frequency is the number of observations belonging to a category.
5. Use a bar chart to show frequencies and a pie chart to show shares of a categorical variable that is not ordinal.