What conclusion can be drawn from this first battle of the Ironclads?

A. The North's navy was stronger than the South's.

B. New technology would be of little help in the war.

C. Merrimack drove the Monitor away from Virginia's shores.

D. The era of wooden warships was at an end.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.