on a wheel with 37 numbers it would be necessary to view 30,195 spins in order to detect a bias of 1/33 with a 90% level of certainty.

Scoz

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May 8, 2019
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I've read the article about the number of observations necessary to detect a favorable number (bias)
the article says that
"Based on the work of Ethier (1982), Keren and Lewis (1994) report that the number of observations necessary to detect a favorable number (bias) is generally quite large. For example, on a wheel with 37 numbers it would be necessary to view 30,195 spins in order to detect a bias of 1/33 with a 90% level of certainty. "

How to calculate it to get 30,195 times. I have no idea. Can someone explain it for me in details? Thank you
 
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