产品成本Y对年份X回归后得到回归直线方程为y=2002.5x,回归系数b=-2.5表示
A.时间每增加一个单位,产品成本平均增加2.5个单位
B.时间每增加一个单位,产品成本平均下降2.5个单位
C.单位产品每变动一个单位,平均需要2.5个时间单位
D.时间每减少一个单位,产品成本平均下降2.5个单位
正确答案是B
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
One important( )of the Coast Guard is to make sure that all ships dutifully follow traffic rules in busy harbors. (responsible)