randomly divided into two groups by the researchers. For three consecutive nights, one group was given access only to water after 8PM while the other group had access to unlimited food. No alcohol was allowed for either group. On the 4th day of the study, researchers found that the people given water only after 8PM performed significantly better on reaction time tests and they had fewer attention span lapses than the group allowed to eat food after 8PM Did the researchers conduct a
Researchers wanted to find out if late night food consumption impairs concentration and alertness in adults in
the U.S. They offered financial incentives to selected U. S. business owners of large, medium, and small
companies, asking them to recruit their employees to participate in a study. Out of a total possible 10,000
employees from these companies, 1200 employees participated in the study. The study took 4 days, and all
participants had to stay in designated hotel rooms starting at 8PM for each night of the study. There were no
hotel nor food costs for the participants. Participants were randomly divided into two groups by the
researchers. For three consecutive nights, one group was given access only to water after 8PM while the
other group had access to unlimited food. No alcohol was allowed for either group. On the 4th day of the
study, researchers found that the people given water only after 8PM performed significantly better on
reaction time tests and they had fewer attention span lapses than the group allowed to eat food after 8PM
Did the researchers conduct an observational study or a controlled experiment? Explain how you know
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