单项选择题

（）将创业计划书的核心提炼出来制作而成的，它是整个创业计划书的精华和亮点，涵盖了计划书的要点。
A、项目名称
B、目录
C、执行概要
D、附录

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多项选择题

公共关系促销包含（）几个要素。 A. 社会关系 B. 公众 C. 组织 D. 传播

单项选择题

A candy bar manufacturer is interested in trying to estimate how sales are influenced by the price of their product. To do this, the company randomly chooses 6 small cities and offers the candy bar at different prices. Using candy bar sales as the dependent variable, the company will conduct a simple linear regression on the data below:
                  City            Price ($)     Sales
            River Falls         1.30          100
            Hudson             1.60            90
            Ellsworth           1.80            90
            Prescott             2.00            40
            Rock Elm          2.40            38
            Stillwater           2.90            32
what is the coefficient of correlation for these data?

A．– 0.8854
B．– 0.7839
C．0.7839
D．0.8854