单项选择题某快餐店想要估计每位顾客午餐的平均花费,在为期3周的时间里选取49名顾客组成了一个简单随机样本。假定总体标准差为15元,则样本均值的抽样标准误差为:()

A.2.14
B.5.66
C.7.28
D.15


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2.单项选择题所有可能实验结果的集合被称为一个()

A.样本空间
B.事件
C.实验
D.概率

9.单项选择题若随机事件A与B满足条件PAB=PAPB,则()

A.A与B相互独立
B.A与B不独立
C.A与B相互排斥
D.A与B相关

10.单项选择题统计学的两大基本内容是()

A.统计资料的收集和分析
B.理论统计和运用统计
C.统计预测和决策
D.描述统计和推断统计

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