stats-man yuze such komplikated formulas with so many variabels,
just bout non poasabel tu get em tu giv out a number
But if yu set sum variabels tu "standard assumes", yu mae foers em tu sae sumthun
At "90% konfidens level' & assuming standard distribushun, & so std values for evreethang els,
100 sampels 8.3 % errer at 90% konfidens leve, assuming 9 other fakters set rite