We wish to estimate what percent of adult residents in a certain county are parents. Out of 400 adult residents sampled, 100 had kids. Based on this, construct a 99% confidence interval for the...

We wish to estimate what percent of adult residents in a certain county are parents. Out of 400 adult residents sampled, 100 had kids. Based on this, construct a 99% confidence interval for the proportion p of adult residents who are parents in this county.


Express your answer in tri-inequality form. Give your answers as decimals, to three places.


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p =  ? ± ?