The employee benefits manager of a medium size business would like to estimate the proportion of full time employees who prefer adopting plan A of the three available health care plans in the coming annual enrollment period. A reliable frame of the company's employees and their tentative health care preferences are available. Using Excel, the manager chose a random sample size of 60 from the frame. There were 19 employees in the sample who preferred plan A.

Construct and Interpret a 95% confidence interval for the proportion of company employees who prefer plan A. Assume that the population consists of the preferences of all employees in the frame.