An industrial engineer would like to determine whether there are more units produced on the night shift than on the day shift. Assume that the population standard deviation for the number of units produced on the day shift is 21 and is 28 on the night shift. A sample of 54 day shift workers showed that the mean number of units produced was 342. A sample of 60 night shift workers showed the mean number of units produced was 351. At the 0.05 significant level, is the average number of units produced on the night shift larger than the day shift