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 56 day-shift workers showed that the mean number of units produced was 336, with a population standard deviation of 19. a sample of 61 night-shift workers showed that the mean number of units produced was 341, with a population standard deviation of 25 units.

a) the decision rule is to reject h0: μd ≥ μn if z < (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.)

b)

the test statistic is z = . (negative amount should be indicated by a minus sign. round your answer to 2 decimal places.)

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Yes it is why .. 

Its stage conventional