1.Jamestown Steel Company manufactures and assembles desks and other office equipment at several plants in western New York State. The weekly production of the Model A325 desk at the Fredonia Plant follows a normal probability distribution with a mean of 200 and a standard deviation of 16. Recently, because of 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 2 weeks for vacation) is 203.5. Is the mean number of desks produced at the Fredonia Plant different from 200 at the 0.01 significance level?

2.The Myrtle Beach International Airport provides a cell phone parking lot where people can wait for a message to pick up arriving passengers. To decide if the cell phone lot has enough parking places, the manager of airport parking needs to know if the mean time in the lot is more than 15 minutes. A sample of 12 recent customers showed they were in the lot the following lengths of time, in minutes.

30 24 28 22 14 2 39 23 23 28 12 31 he 0.05 significance level, is it reasonable to conclude that the mean time in the 1 inutes