A student's science fair project involves studying the effects of fertilizer on grass height. After four weeks of measuring height weekly, the student was not able to tell any difference between two pots of grass he had fertilized and watered weekly. How could this experiment be improved?

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A student's science fair project involves studying the effects of fertilizer on grass height. After four weeks of measuring height weekly, the student was not able to tell any difference between two pots of grass he had fertilized and watered weekly. How could this experiment be improved?