Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the night shift than on the day shift. A sample of 53 day-shift workers showed that the mean number of units produced was 355, with a population standard deviation of 24. A sample of 62 night-shift workers showed that the mean number of units produced was 363, with a population standard deviation of 32 units. At the .01 significance level, is the number of units produced on the night shift larger? 1. The decision rule is to reject HO: d n if z < _. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.) 2. The test statistic is z = _. (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)