Graphical Perception Experiment
Classroom Activity - Cleveland & McGill Replication
Trial 1: Bar Chart
Which is smaller? _______
What percentage is the smaller of the larger? _______%
Trial 2: Bar Chart
Which is smaller? _______
What percentage is the smaller of the larger? _______%
Trial 3: Pie Chart
Which is smaller? _______
What percentage is the smaller of the larger? _______%
Trial 4: Pie Chart
Which is smaller? _______
What percentage is the smaller of the larger? _______%
Trial 5: Bubble Chart
Which is smaller? _______
What percentage is the smaller of the larger? _______%
Trial 6: Bubble Chart
Which is smaller? _______
What percentage is the smaller of the larger? _______%
Your Error Calculations
Error = |Your estimate - True percent|
| Trial | Your Estimate | True % | Error |
|---|---|---|---|
| 1 (Bar) | _____% | ____% | _____ |
| 2 (Bar) | _____% | ____% | _____ |
| 3 (Pie) | _____% | ____% | _____ |
| 4 (Pie) | _____% | ____% | _____ |
| 5 (Bubble) | _____% | ____% | _____ |
| 6 (Bubble) | _____% | ____% | _____ |
Average Error by Chart Type
Bar Chart Average Error: (Error 1 + Error 2) / 2 = _______
Pie Chart Average Error: (Error 3 + Error 4) / 2 = _______
Bubble Chart Average Error: (Error 5 + Error 6) / 2 = _______
