### Conference interval

A consulting firm which does consulting jobs on a cost per job basis wants to estimate its average pay per hour. The firm's manager takes a random sample of n=30 jobs and calculates the pay per an hour. The par per an hour values are listed below, rounded to the nearest dollar. 17 23 14 20 68 40 31 19 19 32 13 37 32 28 34 23 2