选择一个随机抽样调查是非常重要的使你的可信度，桑德拉说。
Picking a random sample is important to make your survey credible, Henning says.
采用此公式可建立任意置信度的可靠寿命抽样表。
The sample table of reliability lives for any confidence can be built by adopting the formulas.
接着，通过建立研究目标、内容抽样、设计分析维度体系、量化处理、信度分析、统计分析6个步骤，进一步详细说明方法的操作过程。
Next, its operation is explained with details by 6 steps:setting up research purposes, sampling, designing analysis dimensions, quantifying data, analyzing reliability and taking statistics.
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