12-14. Atime-and-motion expert feels that she can shorten the workers handling time for 5lb. packages in the shipping department of a candy manufacturer.

Suppose n = 10 workers are chosen at random. Time-and-motion readings

(in minutes) on them before and after the completion of a training program appear as Sample: 1 2 3 4 5 6 7 8 9 10 Before: 7 7 8 7 9 7 6 8 7 7 After: 6 7 6 5 7 5 4 6 4 4 For α = 0.05, has the average handling time per worker for a 5lb. package decreased?