The first researcher concluded that because the coefficient for the variable $ Per Pupil was positive in his results, spending additional money on students would have a positive effect on SAT-M scores. This researcher therefore recommended more money be spent on students. The second researcher concluded that because the coefficient for the variable $ Per Pupil was negative in his results, spending additional money on students would have a negative effect on SAT-M scores. This researcher therefore recommended less money be spent on students. Even though the researchers used the same data, these two conclusions are different because

Group of answer choices

A) an error must have been made by one of the researchers.

B) both researchers failed to take into account that in their analyses,1, the coefficient of the variable $ Per Pupil, was not significant at even the 0.10 significance level. Hence neither researcher could conclude thatwas significantly different from 0.

C) there must have been an influential observation in the data, rendering the analyses inappropriate.

D) the researchers did not use the same set of explanatory variables in their models.