WILL FAN AND MEDAL

A school principal wants to observe if natural light has an effect in the classroom learning. The principal randomly chooses two groups of students of the same age and grade, and places both groups in rooms on opposite sides of the school, one facing east and one facing west, during a 10 am class. The test scores of both classes are compared at the end of the semester.How could this observation be changed into a valid experiment of the effects of natural light?

Question

WILL FAN AND MEDAL

A school principal wants to observe if natural light has an effect in the classroom learning. The principal randomly chooses two groups of students of the same age and grade, and places both groups in rooms on opposite sides of the school, one facing east and one facing west, during a 10 am class. The test scores of both classes are compared at the end of the semester.How could this observation be changed into a valid experiment of the effects of natural light?

anonymous · Answer

A by including classrooms facing north and south
B by introducing adjustable blinds in each classroom 
C by tinting the windows in both classrooms with the same film 
D by introducing adjustable light fixtures in each classroom

amistre64 · Answer

dunno, but i see no control group

anonymous · Answer

@kropot72

anonymous · Answer

@Kainui

anonymous · Answer

@SolomonZelman

directrix · Answer

It seems to me that the classes facing the other two directions would have to be included.

Filtering or otherwise altering the natural light into the classroom does not seem like a way to make a valid study of the effects of natural light for all the students.