08 Feb 18 2. The following paragraph describes an actual study. After reading th
ID: 3044142 • Letter: 0
Question
08 Feb 18 2. The following paragraph describes an actual study. After reading the description, determine whether the study is an observational or experimental study. Justify your answer with specific references to the information in the study. "Before the opening of th old airport, children near both sites were recruited into aircraft-noise groups (aircraft noise at present or pending) and control groups with no aircraft noise and closely matched for socio-economic status. A total of 326 children (mean age 10.4 years) took part in three data-collection waves, one before and two after the switch-over of the airports. After the switch to the new airport, long term memory and reading were found to be impaired in the noise group at the new airport, and improved in the formerly noise-exposed group at the old airport."Explanation / Answer
This is an example of experimental study
In an observational study investigators observe subjects and measure variables of interest without assigning treatments to the subjects. The treatment that each subject receives is determined beyond the control of the investigator.
In an experiment investigators apply treatments to experimental units (people,animals, plots of land, etc.) and then proceed to observe the effect of the treatments on the experimental units
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