题干：在标准回归方程式y = a + bx里， B代表什么
A：自变量
B 因变量
C 常量
D可变系数
考点：Budgeting Concepts and Forecasting Techniques-Correlation and Regression
关键词：y = a + bx
解题思路：y = a + bx
Y是因变量 A是常量 B是自变量系数 X是自变量
Answer (D) is correct . In the standard regression equation, b?represents the variable coefficient. For example, in a cost determination regression, y equals total costs, b is the variable cost per unit, x is the number of units produced, and a is fixed cost.
Answer (A) is incorrect because The independent variable is x .
Answer (B) is incorrect because The dependent variable is y .
Answer (C) is incorrect because The constant coefficient is? a .
