Hi

E = .05,  90% confident...then z = 1.645 (See Below)

n = [z*SD/E]^2

0r

n = p(1-p)(z/E)^2  (Depending on Info given)

IF no other INof Given:

n = .50(.50)(z/E)^2

Always round UP to NEXT Integer

 CI	z = value

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576



 

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