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gibbso: 金币+20, 翻译EPI+1, ★★★★★最佳答案, 感谢 2016-01-15 10:16:28
Cochran经典公式法 分析表明，镉的S、N（4 km×4 km）和M（8 km×8 km）尺度网格 采样数量 均满足在 c 为95%，相对误差为 15%的 Cochran公式 获取的 合理采样数量，而L（16 km×16 km）尺度 则 无法满足。铬的 S、N、M 和 L尺度网格采样数量 均 满足在 置信水平为95%，相对误差为 15%的 Cochran公式获取的 合理 采样数量。
According to the analysis by Cochran classical formula, it shows that grid scale sampling number of both cadmium's S、N（4 km×4 km） and M（8 km×8 km）can satisfy the reasonable sampling number calculated by Cochran formula with the confidence level of 95% and relative error of 15%, which cannot be satisfied by L（16 km×16 km）scale. The grid scale sampling number of chromium's S, N, M and L can satisfy the reasonable sampling number obtained by Cochran formula with the confidence level of 95% and relative error of 15%. |
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