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Some studies show that high school students are more successful when the school day begins after 9 am. To test this theory,
Lake High School changes its school day start time from 7 am to 9 am. Which of the following methods would best describe
the study above?
OA. observational study
OB. controlled experiment
OC. survey
OD. experimental study
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DONKEYKONG35

Answer:

i think that the answer is b

Step-by-step explanation:

because there doing an  experiment in a controlled environment just to see what happen and if it works or if its true.

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