In describing the data-generating process for "click-throughs" for one of your firm's advertising campaigns you've assumed the following relationship: Yi = f (Hi, Ji) + Ui, where Yi is if individual i clicked through, Hi is individual i's household income, Ji is an indicator for whether or not individual i has a job. What type of factors might be contained in Ui?
A. A factor that affects Hi but does not affect Yi.
B. A factor that affects Ji but does not affect Yi.
C. A factor that affects Hi and Yi.
D. None of the answers is correct.
Answer: C
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A species that is confined to the limited area in which it evolved is:
a. endemic b. endangered c. threatened d. extinct e. exotic
A hypothesis can best be described as a(n):
a. data point b. conclusion c. observation d. tentative explanation e. stepwise problem-solving approach
The ozone hole over Antarctica and the general lowering of ozone levels elsewhere in the stratosphere have been attributed to the ozone-destroying properties of
A) endocrine-disrupting chemicals. B) nitrogen oxides. C) sulfur dioxide. D) chlorofluorocarbons (CFCs). E) carbon dioxide and methane.
The residents of a small town are concerned about possible pollutants being released by a nearby chemical plant. The cause of their concern is the recent discovery of dozens of small tadpoles with legs in ponds near the chemical plant. What is a possible explanation for these legged tadpoles?
A. The chemical plant is releasing chemicals that are similar in structure to G proteins. B. The chemical plant is releasing chemicals that are similar in structure to steroid hormones. C. The chemical plant is releasing chemicals that are similar in structure to aldosterone. D. The chemical plant is releasing chemicals that are similar in structure to cyclic AMP. E. The chemical plant is releasing chemicals that are similar in structure to thyroid hormones.