A laptop computer maker uses battery packs supplied by two companies, A and B. Both brands should have the same average battery life between charges (LBC); however, the computer maker seems to receive more complaints about shorter LBC than expected for battery packs supplied by company B. If the LBC for battery packs supplied by company B is shorter than the LBC for battery packs supplied by company A, the laptop computer maker will change suppliers.

Before making any changes to their suppliers, the laptop maker wants to determine if there is any validity to the claim. Ten new battery packs from each brand were randomly selected from recent production runs and installed on the same models of laptops. The laptops were run until the battery packs were completely discharged.

Following are the observed LBCs, in hours, for each brand:

Brand A

3.2, 3.4, 2.8, 3.0, 3.0, 3.0, 2.8, 2.9, 3.0, 3.0

Brand B

3.0, 3.5, 2.9, 3.1, 2.3, 2.0, 3.0, 2.9, 3.0, 4.1

Required:
Using MS Excel, create two properly labeled histograms, one for the LBCs of Brand A and one for the LBCs of Brand B. What can you conclude from these histograms?