Variables
Explanatory & Response Variables
Like x and y in algebra, explanatory and response variables are the yin and the yang of studies in statistics.
Confounding & Lurking Variables
"Confounding" and "lurking" are the words statistics people use to say "oops". As in, "oops, I didn't account for that variable." Stay tuned for a couple examples and the one tried and tested way to avoid these "oops" in your own experiments. (You're doing experiments, right?)