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.