Hi, I am conducting a 3x2 factorial experimental design to test which batteries hold the most voltage at the end of thre

[answerhappygod]

Hi,
I am conducting a 3x2 factorial experimental design to test
which batteries hold the most voltage at the end of three hours in
two different brands of torches.
My factors are:
Torches: Levels are: Dorcy and Jackson
Batteries: Levels are: Energizer, Eveready, Duracell.
to be replicated 3 times each.
I'm having trouble deciding what the experimental units would
be? Can anyone tell me?
Also, would it be better to completely randomize it, or block
randomized?
Thank you very much.