Histograms Flashcards

A type of bar chart used to represent grouped continuous data, where the area of each bar is proportional to the frequency.

The height of a bar in a histogram, calculated as frequency divided by class width.

The difference between the upper and lower boundaries of a class interval in a histogram.

Frequency = Frequency density × Class width.

To display the distribution of continuous data and show how data is spread across intervals.

In histograms, the bars touch, and the area of the bar represents frequency. In bar charts, the bars do not touch, and the height represents frequency.

Look at the height (frequency density) and width of each bar to determine the frequency for each class interval.

Histograms can have unequal class intervals, but the area of the bar must still represent the frequency.

1. Calculate frequency density for each class. 2. Label axes (frequency density on the vertical axis). 3. Draw bars for each class interval.

The horizontal axis represents the continuous variable, and the vertical axis represents frequency density.