Question: An industrial engineer at Lyons Products would like to determine whether there are more units produced on the afternoon shift than the morning shift. A sample of 50 morning-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers showed the mean number of units produced was 351, with a standard deviation of 28 units. At the .05 significance level, is the mean number of units produced on the afternoon-shift larger?