单项选择题

是来自正态总体X~N( ,)的样本，用估计法估计参数,分别为（）

A．

B．

C．

D．

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单项选择题Which of the following statement is true when referring to the five forces model?

A．Though potentially detrimental to the profit potential of an industry, high levels of competition can benefit the consumer in a number of ways.
B．Wide existence of substitutes will increase both the power of suppliers and the attractiveness of market.
C．If the customer purchases large volumes of standardized products from the seller, buyer bargaining power is low.
D．Porter’s Five Forces Model looks deeply into a company and finds out problems within the internal organization.

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是来自正态总体X~N( ,)的样本，用估计法估 计参数,分别为（）

是来自正态总体X~N( ,)的样本，用估计法估计参数,分别为（）