Which statement BEST descrlbes an organ? O the process in which tissues combine
O the basic unit of all living things; a building block
Oa group of tissues joined together to perform a specific function
O the smallest unit in a system that can function on its own

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.