Mathematics, 13.06.2020 11:57, tiaholmes31

A school principal to observe how the natural circulation of air has an affect on Classroom morning. The principal randomly chooses a group of students of same age and grade and places them in a room with open windows the test scores of the classes are recorded and analyzed the end of the semester. How could this observation be changed into a valid experiment effects of air circulation

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A school principal to observe how the natural circulation of air has an affect on Classroom morning....