Hi , Previously Posted:

invNorm( .80 + (1-.80)/2) = invNorm( .80 + .10) = invNorm(.90) = 1.2816

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CI =	z = value

80%     z = 1.282

90%	z =1.645

92%	z = 1.751

95%	z = 1.96

98%	z = 2.326

99%	z = 2.576

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