The independent variable in this data is the type of puzzle being solved. The 3x3 times only show the results for 3x3 cubes; the 2x2 times only show the results for 2x2 cubes. The dependent variables are the solving method that I am using, the brand or quality of cube being used for each solve, the amount of practice leading up to the solves, stress levels, and luck during the solves.