56. A Roper Starch survey asked employees ages 18 to 29 whether they would prefer better health insurance or a raise in salary (USA Today, September 5, 2000). Answer the following questions assuming 340 of 500 employees said they would prefer better health insurance over a raise.

a. What is the point estimate of the proportion of employees ages 18 to 29 who would prefer better health insurance?

b. What is the 95% confidence interval estimate of the population proportion?