Triangle pqr is transformed to similar triangle p'q'r'.
what is the scale factor of dilation?
1 over 2
1 over 3
1 over 4
1 over 5
explain your work, it'd really if i understood why that's the answer then just accepting an answer. i'm really confused so , if you can, explain your work!

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.