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Unformatted text preview: ix. Expectancy B. Controlling threats i. Randomization ii. Placebos, blind and double-blind set-ups iii. Uncontrolled threats a. reactive or interactive effects b. instrumentation c. experimental mortality IV. Threats to external validity A. Types of threats i. Reactive or interactive effects of testing ii. Interaction of selection bias and experimental treatment iii. Reactive effects of experimental arrangements iv. Multiple-treatment interference B. Controlling threats V. Types of Designs A. Preexperimental B. Experimental C. Quasi-experimental...
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- Fall '07