A school district is testing a new math curriculum. They select 5050 classrooms from different schools. The classrooms are randomly assigned to use either the new curriculum or the standard curriculum for one semester. At the end of the semester, students' math scores are compared. What are the experimental units and the treatments in this experiment?

Experimental units: 5050 classroomsTreatments: new curriculum and standard curriculum

Experimental units: math scoresTreatments: before and after the semester

Experimental units: one semester of teachingTreatments: classrooms and curricula

Experimental units: new curriculum and standard curriculumTreatments: 5050 classrooms

A school district is testing a new math curriculum. They select 5...

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