Choosing the wrong chart = wrong interpretation. This is not optional—you must match chart to purpose.
📈 Line Chart (Trends Over Time)
6
Used when:
- Data changes over time
Example: stock prices, monthly revenue
📊 Bar Chart (Comparisons)
7
Used when:
- Comparing categories
Example: marks of students, sales by product
📉 Histogram (Distribution)
6
Used when:
- Understanding distribution of data
Example: age distribution, exam scores
🔵 Scatter Plot (Relationships)
5
Used when:
- Studying relationship between two variables
Example: hours studied vs marks
❓ Check Your Understanding:
- Why would a bar chart fail for time-series data?
- When should you NOT use a histogram?
- What does a scatter plot tell that a bar chart cannot?
🧪 Practice Dataset:
| Student | Hours Studied | Marks |
|---|---|---|
| A | 2 | 40 |
| B | 4 | 50 |
| C | 6 | 65 |
| D | 8 | 80 |
👉 Tasks:
- Create a scatter plot
- Identify the relationship
- Is it strong or weak correlation?