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SamanthaX
New Member

USA
1 Posts

 Posted - 10/15/2007 :  18:23:49 With a confidence level of .95 and a confident interval of 5 and apopulation of 20,000 what is the sample size?With a confidence level of .99 and a confident interval of 5 and apopulation of 20,000 what is the sample size?Finally, using the sample size for question 1 and 2 and a responsedistribution of 50% (i.e., percentage box) what is the confidenceinterval 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 provideSincerely,Grateful

tkhunny

USA
1001 Posts

 Posted - 10/16/2007 :  12:29:43 Didn't we do this one already?You should have a formula, something like this:n = zs/dn is the sample sizez is the z-score associated with your confidence levels 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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