Most of the solid mineral production of Texas comes from the Llano Uplift region

When research participants know what condition they have been assigned to, they might change their behaviors in ways that would be expected from somebody in that condition. This problem can be avoided by using

a. a placebo group. b. random assignment of participants to groups. c. mundane realism. d. a blind study.

Affirmative action policies were first developed under President Lyndon B. Johnson

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