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 Probability and Statistics
 Confidence level
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SamanthaX
New Member

USA
1 Posts

Posted - 10/15/2007 :  18:23:49  Show Profile
With a confidence level of .95 and a confident interval of 5 and a
population of 20,000 what is the sample size?

With a confidence level of .99 and a confident interval of 5 and a
population of 20,000 what is the sample size?

Finally, using the sample size for question 1 and 2 and a response
distribution of 50% (i.e., percentage box) what is the confidence
interval for questions 1 and 2.

If you had the time to explain how you figured those out, that would help me tremendously :~)
Thank you in advance for any assistance you can provide
Sincerely,
Grateful
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tkhunny
Advanced Member

USA
1001 Posts

Posted - 10/16/2007 :  12:29:43  Show Profile
Didn't we do this one already?

You should have a formula, something like this:

n = zs/d

n is the sample size
z is the z-score associated with your confidence level
s is your variance, calculated, estimated or assumed. It is accepted practice to use a nice upper bound, failign other information.
d is the maximum acceptable deviation.

I'm not sure your questions have sufficietn information, but give it some thought.
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