// Start Screen

Graphical Perception Experiment

In this study you will view a series of charts. In each chart, two elements are marked with a dot (●). Your task is to answer:

"What percentage is the smaller marked value of the larger marked value?"

Enter a participant ID and press Start.



// Instructions Screen

Instructions

You will complete 60 trials total — 20 bar charts, 20 pie charts, and 20 stacked bar charts, shown in random order.

For each trial:

  1. Find the two elements marked with a black dot.
  2. Estimate: what percentage is the smaller of the larger?
  3. Type a whole number (0–100) and press Submit or hit Enter.

Example: if one bar has height 30 and another has height 60, the answer is 50 (30 is 50% of 60).

// Trial Screen
What percentage is the smaller of the larger?
( smaller ÷ larger × 100 ) — enter a whole number 0–100
// Results Screen

Session Complete!

Copy the CSV data below and paste it into the master results file: