Samuel Gompers is most recognized for:

a. the invention of air brakes for trains.
b. his role as an early union leader.
c. invention of a steel manufacturing process.
d. the development of refrigerated train cars.

b. his role as an early union leader.

Economics

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As voters "vote with their feet" and move to political districts where the median-voter's preference is closer to their own, the median-voter's preference will:

A. Strengthen B. Weaken C. Shift D. Stagnate

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?Which of the following rules out perfect collinearity among the regressors?

A. ??Multiple regression B. ?Simple regression C. ?Time series regression D. ?Cross-sectional regression

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