Sarah is testing different types of planting soil to determine which type is mos

Question

Sarah is testing different types of planting soil to determine which type is most effective in growing blueberry bushes. She purchases two different brands of planting sol from a local store. Sarah applies Brand A to 1 area of the yard and Brand B to another area of the yard, both of which receive full sunlight. She waters the area with Brand B daily; she waters the area with Brand A every other day. At the end of the study, Sarah concludes Brand B is more effective in growing blueberry bushes. Why is her conclusion not valid?

Explanation / Answer

Sarah's conclusion that brand B is more effective in growing blueberry is invalid because:
1) She did not ensure all other factors (except different planting soil) are equal since she watered area with brand B daily and watered area with brand A every other day. So it maybe that bluberry planting requries to be watered daily so the growth of blueberry bushes could be due to watering reason and bot planting soil's brand B.
So, she can't be sure about that conclusion saying brand B is better, hence her conclusion is invalid.  

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