What are Graphical Representations?
Graphical representations are visual ways to display data, making it easier to understand patterns, trends, and comparisons at a glance.
Types of Graphs:
| Graph Type | Best Used For | Key Feature |
|---|---|---|
| **Histogram** | Showing distribution of continuous data | Bars touch each other (no gaps) |
| **Frequency Polygon** | Comparing multiple distributions | Line connecting midpoints |
Bar Graph:
- Used for discrete data (separate categories)
- Bars have equal width with gaps between them
- Height of bar represents frequency
- Can be vertical or horizontal
Histogram:
- Used for continuous data grouped into class intervals
- Bars touch each other (no gaps)
- Width of bar represents class interval size
- Area of bar represents frequency
Frequency Polygon:
- Created by joining the midpoints of histogram bars
- Starts and ends on the x-axis (at frequency 0)
- Useful for comparing two or more data sets on same graph