There were five separate experiments conducted to determine if noise (from window-type air conditioners) in classrooms affects the performance of students in standardized intelligence tests taken in those classrooms: Experiment A: 120 students were randomly divided into four groups of 30 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. Two of the rooms had noisy AC units and two didn't. The rooms are randomly interspersed. Experiment B: 120 students were randomly divided into eight groups of 15 students each and randomly assigned a classroom per group and given 90 minutes to complete the same test. Four of the rooms had noisy AC units and four didn't. The rooms are randomly interspersed. Experiment C: 120 students were randomly divided into four groups of 30 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. All four rooms had noisy AC units. The following day, this procedure was repeated except all the four rooms used had quiet AC units and the exam used is different (from that of the first day) but is otherwise equivalent. Experiment D: 120 students were randomly divided into four groups of 30 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. Two of the four rooms had noisy AC units, two had quiet AC units. The rooms are randomly interspersed. The following day, this procedure was repeated except those who were in quiet rooms in the previous run were assigned to noisy rooms, and vice versa and the exam used is different but is otherwise equivalent. Experiment E: 120 students were randomly divided into eight groups of 15 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. All eight rooms had noisy AC units. The following day, this procedure was repeated except all the eight rooms used had quiet AC units and the exam used is different (from that of the first day) but is otherwise equivalent. Which experiment(s) is most affected/ biased by potential long-term effects of air conditioning?
There were five separate experiments conducted to determine if noise (from window-type air conditioners) in classrooms affects the performance of students in standardized intelligence tests taken in those classrooms:
Experiment A: 120 students were randomly divided into four groups of 30 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. Two of the rooms had noisy AC units and two didn't. The rooms are randomly interspersed.
Experiment B: 120 students were randomly divided into eight groups of 15 students each and randomly assigned a classroom per group and given 90 minutes to complete the same test. Four of the rooms had noisy AC units and four didn't. The rooms are randomly interspersed.
Experiment C: 120 students were randomly divided into four groups of 30 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. All four rooms had noisy AC units. The following day, this procedure was repeated except all the four rooms used had quiet AC units and the exam used is different (from that of the first day) but is otherwise equivalent.
Experiment D: 120 students were randomly divided into four groups of 30 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. Two of the four rooms had noisy AC units, two had quiet AC units. The rooms are randomly interspersed. The following day, this procedure was repeated except those who were in quiet rooms in the previous run were assigned to noisy rooms, and vice versa and the exam used is different but is otherwise equivalent.
Experiment E: 120 students were randomly divided into eight groups of 15 students each and randomly assigned to a classroom per group and given 90 minutes to complete the same test. All eight rooms had noisy AC units. The following day, this procedure was repeated except all the eight rooms used had quiet AC units and the exam used is different (from that of the first day) but is otherwise equivalent.
Which experiment(s) is most affected/ biased by potential long-term effects of air conditioning?
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