| 2-1 | $ t = \frac{{\left| {\bar x - \mu } \right|}}{s}\sqrt n $ | 2.1.1 |
| 2-2 | $ F = \frac{{s_1^2}}{{s_2^2}} $ | 2.1.2 |
| 2-3 | $ {s}_{{\rm{合并}}}=\sqrt{\frac{\left({n}_{1}-1\right){s}_{1}^{2}+\left({n}_{2}-1\right){s}_{2}^{2}}{{n}_{1}+{n}_{2}-2}} $ | 2.1.2 |
| 2-4 | $ t=\frac{\left|{\overline{x}}_{1}-{\overline{x}}_{2}\right|}{{s}_{{\rm{合并}}}}\sqrt{\frac{{n}_{1}{n}_{2}}{{n}_{1}+{n}_{2}}} $ | 2.1.2 |
| 2-5 | $ \mu = \bar x \pm \frac{{ts}}{{\sqrt n }} $ | 2.1.2 |
| 2-6 | $ t = \frac{{\left| {{{\bar x}_1} - {{\bar x}_2}} \right|}}{{\sqrt {\frac{{s_1^2}}{{{n_1}}} + \frac{{s_2^2}}{{{n_2}}}} }} $ | 2.1.2 |
| 2-7 | $ f = \frac{{{{\left( {\frac{{s_1^2}}{{{n_1}}} + \frac{{s_2^2}}{{{n_2}}}} \right)}^2}}}{{\frac{{{{\left( {\frac{{s_1^2}}{{{n_1}}}} \right)}^2}}}{{{n_1} + 1}} + \frac{{{{\left( {\frac{{s_2^2}}{{{n_2}}}} \right)}^2}}}{{{n_2} + 2}}}} - 2 $ | 2.1.2 |
| 2-8 | $ t = \frac{{\left| {\bar d - 0} \right|}}{{{s_d}}}\sqrt n = \frac{{\left| {\bar d} \right|}}{{{s_d}}}\sqrt n $ | 2.2 |
| 3-1 | $ {s_d} = \sqrt {\frac{{\sum\limits_{i = 1}^n {{{\left( {{d_i} - \bar d} \right)}^2}} }}{{n - 1}}} = 0.523 $ | 3 |