Re: Problem on Confidence Interval

On Feb 27, 12:00 pm, "Anon." <bob.oh...@xxxxxxxxxxx> wrote:
Satish wrote:
Hi All,

Request you to provide me answer to the following question relevant to
Confidence Interval.

For sigma (Standard deviation) = 15, what sample size is required to
specify 99% confidence interval of ±5 units for mean?

Please solve this problem.

I guess this is a good point to explain the rules about doing homework
on sci.stat.math. Basically, we're not here to do your homework for
you: you're assigned it so that you will do it yourself, and learn from
the experience.

On the other hand, if you can demonstrate that you've made a serious
attempt at it, then we'll give hints, and make suggestions. I think the
ideal case is where a student says "I did x and y, got to this point,
but can't work out what to do next. I think I should try z, but can't
see how/why." It helps us focus on what the student doesn't understand,
which helps them learn too.

Bob

--
Bob O'Hara
Department of Mathematics and Statistics
P.O. Box 68 (Gustaf Hällströmin katu 2b)
FIN-00014 University of Helsinki
Finland

Telephone: +358-9-191 51479
Mobile: +358 50 599 0540
Fax: +358-9-191 51400
WWW: http://www.RNI.Helsinki.FI/~boh/
Journal of Negative Results - EEB:www.jnr-eeb.org

Hi Bob,

I did try to solve this problem but could not. Yes, I do agree that I
should be more explanatory. I do appreciate your thoughts as it would
help us to learn from our experiences.

I also read through several books, yet could not find the solution as
the mean value is not provided.

Request to provide me hints, I will try to solve and come back for
clarification.

Thanks and Regards,
Satish



.

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