The following was done in an experiment to determine if noise (from window-type airconditioners) in classrooms affects the performance of students in standardized intelligence tests: 120 students were randomly divided into four groups of 30 students each, randomly assigned 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. How many independent samples per treatment did this experiment have?

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The following was done in an experiment to determine if noise (from window-type airconditioners) in classrooms affects the performance of students in standardized intelligence tests: 120 students were randomly divided into four groups of 30 students each, randomly assigned 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.

How many independent samples per treatment did this experiment have?

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