Re: Help with Stat Problem
From: Stan Brown (the_stan_brown_at_fastmail.fm)
Date: 06/10/04
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Date: Wed, 9 Jun 2004 21:37:48 -0400
"Jen" <jfern_118@excite.com> wrote in sci.stat.edu:
>Can anyone help with the following problem...
>
>Madam Helga claims to be a psychic. A national TV talk personality
>plans to test her in a live TV broadcast. The process will entail
>asking Madam Helga a series of 20 independent questions with Yes/No
>answers. The questions would be of the nature that she could not have
>any way of knowing the answer from prior knowlege. she will be
>considered a psychic if she correctly answers more than a specified
>numer (called the cut-off) of the questions. The cut-off must be set
>so that the chance of guessing the number or more is no greater than 5
>percent.
If she purely guesses, her chance of getting one right is .5. Her
chance of getting two right, since they are independent, is .5^2 and
her chance of getting n right is .5^n (the nth power of.5).
You now have an inequality in n. Solve it.
--
Stan Brown, Oak Road Systems, Cortland County, New York, USA
http://OakRoadSystems.com/
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