| Term | Description | Formula |
|---|---|---|
| standard deviation | $\sqrt{variance}$ | $\sqrt{\frac{\sum(x-\mu)^2}{n-1}}$ |
| variance | spread from mean | $\frac{\sum(x-\mu)^2}{n-1}$ |
| confidence interval | The range of values that let you be x% certain that the real value falls in there for some measure | |