Mathematics, 25.09.2020 14:01, hallkayleel0lozgxtq

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?
O A. controlled experiment
OB. survey
OC. experimental study
OD. observational study

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