levitt and dubner support the claim with the reason: sumo wrestlers who win eight or more matches earn a higher rank than those who do not. which evidence supports this reason?
The question is incomplete. Based on the full question, it is statistical.
This is an excerpt from Stephen Levitt and Stephen Dubner's Freakonomics.
The excerpt gives the statistical data of the wrestlers. The win-loss percentage between 7-7 wrestlers and 8-6 wrestlers is judged when either one of them is in the bubble the next time.
There will not be pressure in the individual match. They win only 40% of the rematches.
