Suppose you are working as an HR personnel for a large company,
and you want to understand the average number of vacation days an
employee takes (ideally this information should be in the system,
but let's say you don't have access yet because you are new to the
company). You collected data from 25 employees, and you calculated
the sample mean to be 12.4 days, with a standard deviation of 1.2
days. Construct a 90% confidence interval for the population
average number of vacation days. Round your answer
to 3 decimal places.