statistics

Common symbols:

• $\mu$ :: mean
• $\bar{x}$ :: mean for a sample
• $\sigma$ :: standard deviation
• $s$ :: sample standard deviation
• $s^2$ or ${\sigma }^2$ :: sample or population variance
• $p$ :: probability
• $\hat{p}$ :: probability from a sample
• $X\sim N$ :: means “x distributed over Normal”, meaning it’s using the Normal Distribution.
• $\bar{X}$ :: sample mean
• $N$ :: The number of scores in a study
• $n$ :: The number of scores in a sample ($n=N$ when in a single-sample test).
• $D$ :: Difference between scores (e.g. in a related-samples t-test
• $\bar{D}$ or ${\mu }_D$ :: average differences in the samples or population respectively.
• $\Sigma D$ :: Sum of score differences