A toy store would like to open a new store in the city of Thousand Oaks, and they would like to know what proportion of households have kids. Out of 100 households sampled, 30 had kids. Based on this,...

A toy store would like to open a new store in the city of Thousand Oaks, and they would like to know what proportion of households have kids. Out of 100 households sampled, 30 had kids. Based on this, to construct a 90% confidence interval for the true population proportion of Thousand Oaks households with kids, you need to use which one of the following calculators?

a) Enter your answer as an
open-interval (i.e., parentheses) using decimals (not percents) accurate to three decimal places.
Confidence interval =

b)Express the same answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places. ?
p
<>

c)Express the same answer using the point estimate and margin of error. Give your answers as decimals, to three places.
p
=  ?± ?