中国和斯里兰卡分别有550人和451人应答者参加了此次问卷调查，应答者的选取采用的是群集抽样和便利抽样两种方法。
550 and 451 respondents were selected from China and Sri Lanka respectively by utilizing cluster and convenience sampling procedures for both contexts.
总之，统计信息的准确性取决于抽样率、数据倾斜(data skew)以及用于数据抽样的数据群集。
In summary, the accuracy of statistics depends on the sampling rate, the data skew, and data clustering for data sampling.
总之，统计信息的准确性取决于抽样率、数据倾斜(data skew)以及用于数据抽样的数据群集。
In summary, the accuracy of statistics depends on the sampling rate, the data skew, and data clustering for data sampling.
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