After Reading the Description Below, Determine Whether the Study Is

After reading the description below, determine whether the study is an observationalor experimental study. Justify your answer with specific references to theinformation in the study."Before expanding the regional airport, children living nearby were determinedto be in one of two aircraft-noise groups (i) aircraft noise at present or (ii)aircraft noise would come with the expansion. Three hundred twenty-sixchildren (mean age = 10.4 years) took part in three data-collection waves, onebefore and two after the expansion of the airports. After the expansion, long-term memory and reading were found to be impaired in the group newlyexposed to aircraft noise."