What should Sleeping Beauty's credence be in a life-or-death coin toss?

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SUMMARY

The discussion centers on the Sleeping Beauty Problem, specifically the credence assignment in a life-or-death coin toss scenario. Participants argue that credence does not necessarily align with betting odds, referencing a paper by Adam Elga and a book by Nick Bostrom on anthropic reasoning. The consensus is that upon awakening, Sleeping Beauty should assign a probability of 1/3 to heads based on the elimination of outcomes, despite the fair coin's odds being 1/2. The conversation emphasizes the importance of understanding the implications of new information in probabilistic reasoning.

PREREQUISITES
  • Understanding of the Sleeping Beauty Problem
  • Familiarity with anthropic reasoning
  • Knowledge of probability theory and credence assignments
  • Awareness of the implications of betting odds in decision-making
NEXT STEPS
  • Read "Anthropic Bias" by Nick Bostrom to deepen understanding of anthropic reasoning
  • Explore the original paper by Adam Elga on the Sleeping Beauty Problem for foundational insights
  • Investigate the relationship between credence and betting odds in probability theory
  • Study examples of observation selection effects in decision-making scenarios
USEFUL FOR

Philosophers, statisticians, and anyone interested in the nuances of probability theory and decision-making under uncertainty will benefit from this discussion.

  • #91
Stephen Tashi said:
Can the person flip the coin on the last day of the week?

Of course.

If so, this is must be justified by a cultural convention - e.g. When we are solving a problem on an exam that is not worded with complete clarity, we know we must assume enough information to solve the problem.

Fortunately this isn't a question on an exam, so I'm not going to worry too much about this. The point is you go in randomly and you don't know if the light has been on for two days or only one day
 
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  • #92
Let’s say when she is wakened someone threatens to kill her unless she can guess the way the coin landed. What would her credence on heads be now?Let’s say we flip two coins and unless they both land tails she is only awakened once. But if both coins land tails she is awakened a thousand times. And then, when she is wakened she is forced to bet her life on the way the coins landed. Should she bet on both having landed tails or on at least one of them having landed heads?
 

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