Brand X Brand Y No cleanser
Area(mm2) Area (mm2) Area (mm2)
0,0,0 0,0.25,1.0, 0,0.50,
,0.20 2.75 1.25,3.0
Which of the following is a
constant, or control variable, in this experiment?
The brand of cleanser that didn't work. (MY ANSWER)
The results observed over four days.
The brand of cleanser that worked best.
1 answer
I think your control is no cleanser.