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A group of students wants to study the effect o f temperature on bacterial growth. To get bacteria, they leave Petri dishes of nutrient agar open on a shelf. They then put the dishes in different places: an incubator (37oC), a refrigerator (10oC), and a freezer (0oC). Bacterial growth is measured by estimating the percentage of each dish covered by bacteria at the end of a 3-day growth period. a) What variables should be standardized?

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