A Classic Experiment

The following questionnaire asks you to make visual judgments about values on a variety of charts. Please make a quick visual judgement and do not try to make precise measurements (mentally or physically); you should not take more than a few seconds for each chart.

You will be asked a total of 60 questions using 3 types of chart. The entire questionnaire should take about 10 to 15 minutes.

Your guesses will be recorded, but no other information about you or that could be used to identify you will be recorded. Press the "begin" button when you are ready to begin.

One of the values marked with a dot is less than the other.

What percentage of the larger value is the smaller value?

For example, if the smaller value is half of the larger value, enter "50."

Thank you for participating!

Please send your results to the creators of this questionnaire.

Your accuracy was %.

If you have any questions, please contact the test creators.