Template:List of statistics symbols

In general, the subscript 0 indicates a value taken from the null hypothesis, H₀, which should be used as much as possible in constructing its test statistic. ... Definitions of other symbols:

$\alpha$, the probability of Type I error (rejecting a null hypothesis when it is in fact true) $n$ = sample size $n_1$ = sample 1 size $n_2$ = sample 2 size $\bar{x}$ = sample mean ${\mu }_0$ = hypothesized population mean ${\mu }_1$ = population 1 mean ${\mu }_2$ = population 2 mean $\sigma$ = population standard deviation ${\sigma }^2$ = population variance $s$ = sample standard deviation ${\sum }^k$ = sum (of $k$ numbers)

$s^2$ = sample variance $s_1$ = sample 1 standard deviation $s_2$ = sample 2 standard deviation $t$ = t statistic $df$ = degrees of freedom $\bar{d}$ = sample mean of differences $d_0$ = hypothesized population mean difference $s_d$ = standard deviation of differences ${\chi }^2$ = Chi-squared statistic

$\hat{p}=\frac{x}{n}$ = sample proportion, unless specified otherwise $p_0$ = hypothesized population proportion $p_1$ = proportion 1 $p_2$ = proportion 2 $d_p$ = hypothesized difference in proportion $\min \{n_1,n_2\}$ = minimum of $n_1$ and $n_2$ $x_1=n_1{p}_1$ $x_2=n_2{p}_2$ $F$ = F statistic