The length, width, and height of a rectangular prism is a, (a-13), and (a+13) respectively, which statement best describes (a-13)a. the width of the rectangular prism is 13 units less than the lengthb. the height of the rectangular prism is 13 units more than the lenghtc. the width of the rectangular prism is 13 units less than the heightd. the length of the rectangular prism is 13 units less than the weight

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.