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 60 day-shift workers showed that the mean number of units produced was 341, with a population standard deviation of 26. A sample of 69 night-shift workers showed that the mean number of units produced was 346, with a population standard deviation of 35 units.

At the .10 significance level, is the number of units produced on the night shift larger?

1.This is a one two-tailed test.
2.The decision rule is to reject H0: μd ≥ μn if z <
3.The test statistic is z =
4.What is your decision regarding H0?