A dean of a business school wanted to know whether the graduates of her school used a statistical inference technique during their first year of employment after graduation. She surveyed 314 graduates and asked about the use of statistical techniques. After tallying up the responses, she found that 204 used statistical inferences within 1 year of graduation. Estimate with 90% confidence the proportion of all business school graduates who use their statistical education within a year of graduation.
This solution provides calculations for confidence intervals in Excel.