1. Out of 600 people sampled, 366 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids. Give your answers as decimals, to four places

2. Express the confidence interval 0.3820.0730.3820.073 in open interval form (i.e., (0.155,0.855)).

3.A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 4% margin of error at a 99% confidence level, what size of sample is needed?