Question 4:
If n = 28, x-bar = 30, and s = 16, construct a confidence interval at a 90% confidence level. Assume the data came from a normally distributed population. Give your answers to one decimal place.
Question 5:
If n = 520 and p-hat = 0.83, construct a 90% confidence interval. Give your answers to three decimals.
Question 6:
Out of 100 people sampled, 57 had kids. Based on this, construct a 99% confidence interval for the true population proportion of people with kids. Give your answers as decimals, to three places.