A randomized block design will be used in an experiment to compare two lotions that protect people from getting sunburned. Which of the following should guide the formation of the blocks?
A) Participants should be kept blind as to which block they are in.
B) Participants should be randomly assigned to blocks.
C) Participants in the same block should receive the same lotion.
D) Participants within each block should be as similar as possible with respect to how easily they get sunburned.
E) Participants with each block should be as different as possible with respect to how easily they get sunburned.
Answer: participants within each block should be as similar as possible with respect to how easily they get sunburned
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