The process of using two regressions to measure the causal effect of a variable while utilizing an instrumental variable is known as:
A. difference in difference.
B. probit.
C. nonlinear least squares.
D. two-stage least squares.
Answer: D
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Figure 3.20
The figure above shows all of the following components except:
A. ribose B. deoxyribose C. triphosphate D. adenosine E. amine
Most species of Gram-positive bacteria are ____.
A. photoautotrophic B. photoheterotrophic C. chemoautotrophic D. chemoheterotrophic E. photochemoautotrophic
Scientists were studying temperature selection among pregnant big brown bats. What would the treatment group be in this experiment?
What will be an ideal response?
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.