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Two different options are under consideration for comparing the lifetimes of three brands of flashlight​ battery,...

Two different options are under consideration for comparing the lifetimes of three brands of flashlight​ battery, using 18 flashlights.

a.

One option is to randomly divide 18 flashlights into three groups of 6 flashlights each and then randomly assign each group to use a different brand of battery. Would this statistical design be a completely randomized design or a randomized block​ design? Explain your answer.

b.

Another option is to use 18 flashlights​ - six different brands of 3 flashlights each​ - and randomly assign the 3 flashlights of each brand to use a different brand of battery. Would this statistical design be a completely randomized design or a randomized block​ design? Explain your answer.

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