Data Interpretation
Types of Data Representation
1. Tables
- Data organized in rows and columns
- Read row and column headers carefully
- Look for patterns and totals
- Check units mentioned
2. Bar Graphs
- Vertical or horizontal bars representing data
- Height/length of bar shows value
- Easy comparison between categories
- Check scale on axis
3. Line Graphs
- Shows trends over time
- Points connected by lines
- Slope indicates rate of change
- Good for comparing multiple series
4. Pie Charts
- Circular chart divided into sectors
- Each sector represents proportion
- Formula: Angle = (Value/Total) × 360°
- Percentage: (Value/Total) × 100
- Total always = 100% or 360°
5. Histogram
- Similar to bar graph but for continuous data
- No gaps between bars
- Shows frequency distribution
6. Caselet/Paragraph
- Data given in paragraph form
- Extract relevant information
- Make your own table if needed
Important Calculations
- Percentage: (Part/Whole) × 100
- Percentage change: [(New - Old)/Old] × 100
- Ratio: Part1 : Part2
- Average: Sum / Count
- Growth rate: [(Final - Initial)/Initial] × 100
Solving Strategy
- Read the chart/table carefully before questions
- Note down key information and units
- Identify what is being asked
- Use approximation for quick calculation
- Double-check your answer
Quick Tips
- Always check the scale and units
- For pie charts, remember total = 360° or 100%
- Look for obvious patterns first
- Use elimination method in options
- Practice reading different chart types
- Time management is crucial