单选题 An analyst does research about sampling and estimation. With respect to statistical analysis, a sample statistics is least described as:
A. the set of rules used to select a sample.
B. quantity computed from a sample.
C. descriptive measure of a sample.

【正确答案】 A

【答案解析】[解析] 当我们使用样本来估计总体的参数时，我们使用的是样本统计量。样本统计量是从样本中计算得到的数值或者描述样本的数据。用来选择样本的规则被称为抽样计划(sampling plan)，所以选项A是不正确的说法。