每一吨铸铁成本(元)倚铸件废品率( % )变动的回归方程为: Y = 50 + 7X, 这意味着( )。
A.
废品率每增加 1% ,成本每吨增加 50 元
B.
废品率每增加 1% ,成本每吨增加 7%
C.
废品率每增加 1% ,成本每吨增加 7 元
D.
如果废品率增加 1% ,则每吨成本为 50 元
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