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 ${\overline {x}}$ = 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 ${\textstyle k}$ numbers)

$s^{2}$ = sample variance $s_{1}$ = sample 1 standard deviation $s_{2}$ = sample 2 standard deviation $t$ = t statistic $df$ = degrees of freedom ${\overline {d}}$ = 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 ${\textstyle n_{1}}$ and ${\textstyle n_{2}}$ $x_{1}=n_{1}p_{1}$ $x_{2}=n_{2}p_{2}$ $F$ = F statistic