Proportional confidence interval formula:
CI90 = p ± (1.645)[√(pq/n)]
...where p = x/n, q = 1 - p, and n = sample size.
Note: ± 1.645 represents 90% confidence interval.
For p in your problem: 350/500
For q: 1 - p = q
n = 500
I let you take it from here to calculate the interval. (Note: convert all fractions to decimals.)
Use the sample data and confidence level to construct the confidence interval estimate of the population proportion p.
n=500, x=350, 90% confidence
?<p<? (Round to three decimal places as needed.)
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