Basic Statistics Statistics Formula Sheet. Descriptions of statistics formulas. Statistics for dummies cheat sheet by deborah j.
Descriptive statistics 1 i i x xx nn 2 1 2 1 1 i xi xx s xx n n y a bx ˆ y a bx 1 1 ii xy xx y y r n ss y x br s s ii. E x 2 the population variance of a discrete random variable x textbook formula v x x all x x pm. The sample standard deviation shortcut formula s s p x 2 pm.
X 2 n pm.
Variance statistics formula large sigma 2 frac sum x bar x 2 n where x items given barx mean n total number of items. The sample standard deviation shortcut formula s s p x 2 pm. Limits for unusual data below. If n is odd then.
