The Intelligence Advisory Board provides information and assessments to the president's director of national intelligence and to the president directly

If we use different methods to observe and measure a phenomenon in two groups, we run the risk of introducing

A) A constraint. B) An additional degree of freedom. C) Researcher bias. D) A confounding factor.

The extension of the right to vote

a. occurred very quickly within a 50-year time period. b. involved a great deal of violence. c. inflamed existing rural–urban divisions in the United Kingdom. d. was done so mainly on the basis of property qualifications. e. was fully completed by 1900.