If n=330 and p' (p-prime) = 0.05, construct a 95% confidence interval.

Question

If n=330 and p' (p-prime) = 0.05, construct a 95% confidence interval.

Give your answers to three decimals.

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Answer 1

The formula for a confidence interval for a proportion is:

p' +/- z-critical * sqrt(p'* (1-p')/n)

here p' is 0.05, n = 330 and z-critical for a 95% CI is 1.96.

plug in the values to get the 95% CI.