Mina is testing different types of lamps to determine which type is most effective for growing strawberry bushes She purchases two different types of lamps from a loc store. Mina applies brand A to one area of the yard and brand B to another area of the yard, both of which receive full surilight Sho waters the area with brand B daily, she waters the area with brand A every other day. At the end of the study, Mina concludes brand B is more effective in growing strawberry bushes. Mina's conclusion valid? Explain why or why not.