Project Maths Paper Two - 95% Confidence Interval

cianserian · 2012-06-09 18:17:44

Hi, Does anybody know for sure how to do out the 95% confidence interval? It seems to be dumbed down from the old papers, so now are we just meant to use 1/√n as the margin or error and add and subtract that from the mean now? Any help would be appreciated.

09-06-2012 06:17PM

#1
cianserian

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Hi,

Does anybody know for sure how to do out the 95% confidence interval? It seems to be dumbed down from the old papers, so now are we just meant to use 1/√n as the margin or error and add and subtract that from the mean now?

Any help would be appreciated.

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#2 09-06-2012 06:19PM

K_1

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sample proportion = p^
population proportion = p
Margin of error = 1/rootn where n = sample size

p^ - 1/rootn < p < p^ + 1/rootn

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