Mina is testing different types of heat lamps to determine which type is most effective for growing strawberry bushes. She purchases two different types of lamps from a local 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 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, Mina concludes brand B is more effective in growing strawberry bushes. Is Mina's conclusion valid? Explain why or why not.

Question

Ireland

Mathematics

14 November, 13:38

Mina is testing different types of heat lamps to determine which type is most effective for growing strawberry bushes. She purchases two different types of lamps from a local 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 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, Mina concludes brand B is more effective in growing strawberry bushes. Is Mina's conclusion valid? Explain why or why not.

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Marcel Callahan · Answer 1

Mina's conclusion is:

Invalid.

Step-by-step explanation:

When you want to evaluate a variable within an experiment, as in this case the effectiveness of a heat lamp to grow strawberry bushes, you should try to ensure that all other variables are equal, if possible, so that the variable investigated is really influential in the final result and allows to determine its effectiveness. As in the experiment, Mina varied the irrigation periods as well, this makes it another influential variable within the experiment, it is very possible that the area with the B mark had better results because its irrigation period was daily while the irrigation period Irrigation in area A was every other day, thus invalidating the experiment and its conclusions.