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QUESTION
Imagine you have been given the responsibility for conducting the famous Crest tes.you are supposed to determine whether brushing with Crest actually...
Imagine you have been given the responsibility for conducting the famous Crest
tes.
...you are supposed to determine whether brushing with Crest actually does reduce cavities. Your boss wants you to use an experimental group and a control group. Come up with at least five potential extraneous
exa.
ples for this experiment.
