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with 80% confidence, for sample proportion 0.56 and a sample size 21, what is the upper...

with 80% confidence, for sample proportion 0.56 and a sample size 21, what is the upper confidence limit?

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Answer #1

Solution :

Given that,

n = 21

Point estimate = sample proportion = = 0.56

1 - = 0.44

Z= 0.84

Margin of error = E = Z * (( * (1 - )) / n)

= 0.84 * (((0.56 * 0.44) / 21)

= 0.091

Upper confidence limit =   + E = 0.56 + 0.091 = 0.651

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