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Stevbo Stevbo
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8 years ago


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#1
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8 years ago
alpha,a = 1-0.90 = 0.10
p = 0.2
n = 100

standard error, SE = sqrt(p(1-p)/n)
SE = sqrt(0.2(1-0.2) / 100) = 0.04

Za/2 = Z0.05= 1.645

confidence interval:
p +/- [Za/2 * SE]
0.2 +/- 0.0658
( 0.1342 , 0.2658 )

upper limit = 0.2658
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