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| unrestricted sample | |||
| sample taken at random | |||
| random sample (抽样) | |||
| ★ random sample | |||
| chance sample | |||
| probability sample | |||
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| random sample | |||
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随 机样本 : 23 phrases in 8 subjects |
| Advertising | 1 |
| Agriculture | 1 |
| Business | 6 |
| Economics | 1 |
| Mathematics | 4 |
| Oil / petroleum | 2 |
| Statistics | 2 |
| Technology | 6 |
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