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【单选题】
根据最乘的原理求出直线回归方程 后，发现原始数据中的某点（xk，yk）的横坐标值xk代入方程算得的为yk ，说明A.
正常现象
B.
计算有错
C.
偏差较大
D.
曲线关系
E.
方程不成立
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A.
Both the equilibrium price and quantity would increase.
B.
Both the equilibrium price and quantity would decrease.
C.
The equilibrium price would increase, and the equilibrium quantity would decrease.
D.
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A.
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B.
destroyed the whole U.S economy.
C.
contributed to economic recovery.
D.
exerted no influence on economy.
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