Examlex
In order to combat any threats to internal validity during sampling procedures, researchers should use ________.
Chairman Of The Joint Chiefs
The highest-ranking and senior-most military officer in the United States Armed Forces, who serves as the principal military advisor to the President, the National Security Council, the Homeland Security Council, and the Secretary of Defense.
Colin Powell
An American military general and statesman who served as the 65th United States Secretary of State, becoming the first African American to hold the position.
Black Senator
A member of the United States Senate who identifies as African-American, representing one of the fifty states in legislative matters.
Carol Mosely Braun
The first African American woman to serve as a U.S. Senator, representing Illinois and breaking barriers for women of color in politics.
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