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Guess the Proportion of Blue Balls
Timing and Instructions

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Comprehension test: Please answer the question at the end of each page. If you fail more than three times in total, your session will finish, and you will receive 50 points for participation. Remaining attempts: {{ attempts }}.

1. The computer will match you another player (a fellow human) who already finished this survey.

2. The computer randomly filled a digital urn with 20 balls. The balls can be either blue balls or red. The specific number of blue balls (B) was determined randomly by the computer, ranging from 2 to 18, with each number having an equal probability of being selected.

Note: The urn will be refilled with a new set of 20 balls for each round.

Here is an image depicting the 20 balls that make up the urn. The colors of the balls are unknown to you.

3. The computer populated the urn with blue and red balls, but neither you nor the other participant knows the proportion of blue balls in the urn, B%.

Your task is to guess the proportion of blue balls, B%!

4. The computer randomly selected 10 balls from the urn and showed them to the other participant.

The other participant was asked to make a guess about the proportion of blue balls in the urn (B%). The other participant may have also observed the guess of a previous participant.

Size of the other participant's sample.