以下为句子列表：
英文: Another decision, which has to be made when conducting a marketing research, concerns the sampling plan. The two basic sampling methods in use today are probabilistic and non-probabilistic sampling.
中文: 同时，执行市场研究时必须制定样本计划。当今使用的两种基本的样本方法是或然样本与非或然样本。
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英文: Methods: 2502 residents above 15 years old were selected and studied through random sampling methods in Beijing.
中文: 方法：采用随机抽样方法对北京市人口15岁以上的2502人进行流行病学调查。
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英文: Through comparative analysis to the test data of tow sampling methods in drilling hole and sampling method in shaft, it was found out by the author that the drilling sampling method has obvious disturbance and depression to the soil sample, which caused t
中文: 笔者通过对钻孔两种方法获取的土样与竖井土样试验数据的对比发现，钻孔取样对土样有明显的扰动和压密作用，造成了土的干密度增大、孔隙比减小、渗透系数降低、压缩模量增大。
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