When you manipulate the independent variable (IV), you want to _____ all other variables so that you won't have to wonder whether it was the manipulation of the IV that caused the outcome or some other variable. Question 71 options: a) control b) cancel c) contraveneEffect size measures the size of the effect of ___ on ___. Question 72 options: a) the IV; the DV b) the variance; the standard deviation c) the standard deviation; the variance d) the DV; the IV