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　　According to linear regression function assumptions, the equation must be linear in:
　　A.     Both the variables and the coefficients.
　　B.     The variables but not necessarily the coefficients.
　　C.     The coefficients but not necessarily the variables.
　　D.     Neither the variables nor the coefficients.
　　Answer：C.
　　Linear regression refers to a regression that is linear in the coefficients/parameters; it may or may not be linear in the variables.