Question

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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Answer 1

i think that the answer is b

Explanation:

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