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What is the formula for an 80% confidence interval for a population portion

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Answer to a math question What is the formula for an 80% confidence interval for a population portion

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Tiffany

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102 Answers

1. Identify the sample proportion:

\hat{p}

.
2. Calculate the value of

for an 80% confidence interval:

Z_{0.10}

.
3. Compute the standard error:

\sqrt{\frac{\hat{p}(1 - \hat{p})}{n}}

.
4. Multiply the standard error by

Z_{0.10}

.
5. Add and subtract the result from the sample proportion

\hat{p}

to get the interval.

Answer:

\hat{p} \pm Z_{0.10} \sqrt{\frac{\hat{p}(1 - \hat{p})}{n}}

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What is the formula for an 80% confidence interval for a population portion

Answer to a math question What is the formula for an 80% confidence interval for a population portion

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