The Area in Dispute Between the United States and Britain $\degree$

question 28

Multiple Choice

The area in dispute between the United States and Britain in 1845 lay between

• A) the forty-second parallel and the Columbia River.
• B) the Cascade Mountains, the Columbia River, and Puget Sound.
• C) the 36\(\degree\)30' line and the Columbia River.
• D) the forty-ninth parallel and the 54\(\degree\) 40' line.
• E) the Columbia River, the forty-ninth parallel, and the Pacific Ocean.

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Definitions:

Independent Variable

The variable in an experiment that is manipulated or changed by the researcher to investigate its effect on the dependent variable.

Dependent Variable

In an experimental study, the variable that is being tested and measured, often considered the effect in a cause-effect relationship.

Control Variable

A control variable is an element that is kept constant throughout an experiment to ensure that the effect on the outcome can be attributed to the variable being tested.

Hypothetical Variable

A variable that is not directly observable, proposed to explain relationships and effects in scientific models.