The Jamestown Steel Company manufactures and assembles desks and other oﬃce equipment at
Several plants. The weekly production of the Model A325 desk follows a normal probability
Distribution, with a mean of 200 and a standard deviation of 16. Recently, due to market expansion,
New production methods have been introduced and new employees hired. The vice president of
Manufacturing would like to investigate whether there has been a change in the weekly production
Of the Model A325 desk. The mean number of desks produced last year (50 weeks, because the
Plant was shut down two weeks for vacation) is 203.5. Is the mean number of desks changed from
200? Test using the .05 signiﬁcance level.

A) Reject the null hypothesis; there is suﬃcient evidence to indicate an increase in the weekly production.
B) Unable to reject the null hypothesis; there is suﬃcient evidence to indicate a change in weekly production.
C) Unable to reject the null hypothesis; there is insuﬃcient evidence to indicate an increase in weekly production.
D) Reject the null hypothesis; there is insuﬃcient evidence to indicate a change in the weekly production.

The Mean Weight of Newborn Infants at a Community Hospital

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