After controlling for Z, the partial correlation coefficient is .78. The bivariate Pearson's r between X and Y was only .51. What should the researcher do next?
a. Use multiple regression techniques to investigate this relationship further.
b. Halt the investigation since these results are mathematically impossible.
c. Conclude that the relationship between Z and Y is direct.
d. Conclude that the relationship between Z and Y is spurious.
ANSWER: a
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