In an effort to control cost, a quality control manager is interested in whether the mean number of ounces of sauce dispensed by bottle filling machines differs from 16 ounces. From the bottling process, the manager collects the following measurements:
16.3, 16.2, 15.8, 15.4, 16.0, 15.6, 15.5, 16.1, 15.9, 16.1
Test at a .05 significance level that the bottle filling machines need adjusting.