Bar charts are graphical representations of categorical data using rectangular bars. The height or length of each bar corresponds to the frequency or relative frequency of a particular category.
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Frequencies: Frequencies refer to the number of times an event or observation occurs in a dataset.
Relative frequencies: Relative frequencies represent the proportion or percentage of observations belonging to each category in relation to the total number of observations.
Categorical data: Categorical data consists of qualitative variables that can be divided into distinct categories or groups.