Suppose one runs the regression of Y on X1 and X2 and the coefficient on X2 is positive. Which of the following correlation conditions must hold in the sample?
A. Y and X2 have a positive unconditional correlation.
B. Y and X1 have a positive unconditional correlation.
C. The partial correlation between Y and X2 holding X1 constant must be positive.
D. The semi-partial correlation between Y and X2 holding X1 constant must be positive.
Answer: D
You might also like to view...
Speciation:a
maintains an intermediate phenotype in a stable environment. b. is the formation of a new species from an ancestral population. c. only occurs when a population is geographically isolated. d. is a change in allele frequencies in a population. e. is the end result of macroevolution but not microevolution.
All protists are unicellular organisms
Indicate whether the statement is true or false
Refer to the accompanying figure. Which structure is specialized to receive stimuli from other neurons and to send
signals to the cell body? a. 1 b. 4 c. 6 d. 7 e. 9
What is the role of adenosine triphosphate (ATP) within a cell?
A) use glucose B) biological molecule that stores energy C) release carbon dioxide D) controls chemical reactions