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 334, with a population standard deviation of 23. A sample of 68 night-shift workers showed that the mean number of units produced was 341, with a population standard deviation of 28 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 rejectH₀:_dnifz< __________(Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

3. The teststatistic isz= ________Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)

4. What is your decision regardingH₀? Reject / Do not Reject ?