Biology, 15.10.2020 08:01, lerasteidl
The school district wanted to determine whether the more expensive floor wax (Brand A) was better than the cheaper (Brand X) floor wax at protecting its floor tiles against scratches. One liter of each of 10 test sections of the cafeteria floor. The test sections were all the same size. Ten (10) other test sections received no wax. After 4 weeks, the number of scratches in each of the test sections was counted.
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