Which of the following statements is true? Flu vaccines contain antibodies from donated blood.
Immunity from vaccination is not as effective as natural immunity.
Children in the United States are no longer vaccinated for polio.
Cowpox cannot be transmitted from one person to another.

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.