A Copy Machine Service Company Provides Maintenance and Repair Service

A copy machine service company provides maintenance and repair service for different types and brands of copiers. The manager of the repair department wants to know if the repair time for brand A is higher than the repair time for brand B. The manager randomly selected eight repair records associated with brand A and eight repair records associated with brand B. The repair times (in minutes) for both samples are given below. The distribution of repair times for both brand A and brand B is highly skewed. What is the appropriate alternative hypothesis for this problem?

A) H_A: D_A is shifted to the left or right of D_B
B) H_A: D_A is shifted to the right of D_B
C) H_A: D_A is shifted to the left of D_B
D) H_A: D_A is equal to D_B