However, U.K. experiments in which schools give students mobile devices in classrooms showed higher motivation, attentiveness and achievement.
A multistage sampling frame was employed in which school districts, schools, and classrooms were randomly selected.
Another study in a large metropolitan area in the United States took advantage of a natural experiment, in which 1 school district closed its schools for 10 days during the 2009 influenza pandemic, while most schools in a neighboring school district did not close.
In November 2012, scientists at The University of Texas Medical Branch at Galveston conducted an experiment in which high school gamers, college gamers and medical residents competed to see who could perform better virtual surgery.
A biochemistry major, Gazzaley had planned to put a chunk of sodium metal into a lake behind campus to make it fizz--a large-scale version of the classic junior high school lab experiment in which adding a pinch of potassium to water creates a spark as the chemical reaction releases energy.
In a recent essay, Mr. Hamer drew parallels between this "privatization experiment on low-performing schools" and infamous projects like the Tuskegee experiment, in which poor black men with syphilis were recruited by federal health researchers and then left untreated.
School breaks and school teacher strikes provide natural experiments in which the effect of school terms on influenza transmission dynamics can be explored.
He described experiments in which students fan out across the school's laboratory fields, taking soil samples, and then using their laptops and hand-held GPS devices to create precise soil quality maps.
Just a few weeks ago, Dr. Hamer likened the push by Mr. Giuliani to privatize the management of five failing schools to the infamous Tuskegee experiments, in which black syphilis patients were deliberately denied treatment.
Wargocki and Wyon [ 22] performed three experiments in which they also adjusted the existing outdoor air supply of the mechanical ventilation of schools by altering the fan capacity.
