Which of the following sentences could not be used to represent the equation X-5 = -10? D A number subtracted from five is equal to negative ten. A number less five equals negative ten. de Five less than a number is negative ten. ko If a number is decreased by five, the result is negative ten.

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.