Perception in Data Visualization
A Quiz to Test Proportional Perception of Visually Encoded Quantities

http://www.everydayanalytics.ca/2014/03/data-visualization-perception-quiz.html

For each question, enter a number greater than or equal to 1, expressing the size of the larger quantity as a multiple of the smaller, which may include decimals (e.g. if the larger quantity is larger by a factor of 5, enter 5.0; if you judge the larger quantity to be two-and-a-half times as large as the smaller, enter 2.5).
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1. 2-D Position
How many times as distant is the dot on the right from the red tick as the dot on the left?
2. Length
How many times as long is the bar on top as the bar on the bottom?
3. Width
How many times as wide is the bar on the right as the bar on the left?
4. Angle
How many times as large is the angle on the right as the angle on the left?
5. Slope
How many times as large is the slope of the line on the right as the slope of the line on the left?
6. Circle Area
How many times as large is the area of the circle on the right as the area of the circle on the left?
7. Circle Radius
How many times as large is the width of the circle on the right as the width of the circle on the left?
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