Historians Are in General Agreement That

question 40

Multiple Choice

Historians are in general agreement that

• A) railroads opened the country and were built at great risk ahead of demand, gambling on the future.
• B) railroads sharply cut down transportation costs, linking the country together in all directions ?and spurring the nation's growth far in advance of anything that might otherwise have been achieved.
• C) railroads were the single innovation of the 19th century that created a great leap forward ?in terms of American economic growth.
• D) none of the above are true.

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Definitions:

Factorial Research

A research design that involves two or more independent variables, also known as factors, and examines their interaction and main effects.

Single-Factor Research

An experimental design where the effect of a single independent variable on a dependent variable is assessed.

Independent Variable

A variable that is manipulated or categorized to observe its effect on a dependent variable in experimental research.

Interaction Effect

In statistics, a circumstance where the effect of one independent variable on a dependent variable is different at different levels of another independent variable.