题目内容：
用最小平方法配合直线趋势，如果y=a+bx中b为负值，则这条直线呈A、下降趋势
B、上升趋势
C、不升不降
D、无法确定
参考答案：
选择题：用最小平方法配合直线趋势，如果y=a+bx中b为负值，则这条直线呈A、下降趋势B、上升趋势C、不升不
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A、下降趋势
B、上升趋势
C、不升不降
D、无法确定
A、下降趋势
B、上升趋势
C、不升不降
D、无法确定
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