We wish to estimate what percent of adult residents in a certain county are parents. Out of 100 adult residents sampled, 78 had kids. Based on this, construct a 90% confidence interval for the...

We wish to estimate what percent of adult residents in a certain county are parents. Out of 100 adult residents sampled, 78 had kids. Based on this, construct a 90% confidence interval for the proportion ππ of adult residents who are parents in this county.