Multiple Choice
Professor O'Connell gives one group of children daily vitamins and the other group no vitamins.The professor observes that English grades improve in children receiving vitamins.English grades begin to drop in children receiving no vitamins.What is the independent variable in this study?
A) age of the children
B) improvement in children's attention spans
C) English grades
D) vitamins
Correct Answer:
Verified
Correct Answer:
Verified
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