After estimating a probit model for the likelihood of a website visitor clicking through conditional on if the visit occurred on a weekday or not, you get the following results: ClickThroughi = -1.2(0.4) + 0.8(0.2)WeekDayi, where standard errors are reported in parenthesis. What would be the calculation that yields the marginal effect of a visit moving from a weekend to a weekday on click-throughs?
A. ?(-1.2 + 0.8) - ?(-1.2)
B. -1.2 + 0.8 = -0.4
C. ?(-1.2)
D. 0.8
Answer: A
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Match the reactant in the TCA cycle on the left with the appropriate enzyme on the right.
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a. exosome b. tube cell c. nephridiopore d. Malpighian tubules
Rosy periwinkle, the nine-banded armadillo, and some species of fungus and bacteria have ________ value to man.
A. medicinal B. agricultural C. no D. indirect E. consumptive use