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Random Assignment
Random assignment is the process by which researchers select individuals from their total sample to participate in a specific condition or group, such that each participant has a specifiable probability of being assigned to each of the groups or conditions. These different conditions or groups represent different levels of the independent variable. Random assignment is generally considered the most important criterion to qualify a research design as an experimental design. A common example of random assignment is a medical trial in which a researcher assigns some participants at random to receive either a treatment drug or a placebo (a pill that looks like the medication but is known to be inert). Because of the random assignment, any differences that are observed in the outcome ...
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28.Differential attrition threatens internal validity becausea. the independent variable is biasedb. reliability of the measures is loweredc.participants differ between the experimental groupsd. pretest sensitization is more likelye.demand characteristics are present
29.Which of the following is used to eliminate demand characteristics?
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34. Why must error variance be minimized in an experiment?
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36. The “experimenter’s dilemma” refers to the trade-off between
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Understanding Statistics in the Behavioral Sciences
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7c.internal and external validityd. treatment and error varianceAnswers to multiple choice above from ch. 9
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8.D9. B11. C12. A14. A15. C18. B19.C20. A21. C22. B23. A25. A27. D28. C29. B34. B36. CSample short answer and fill-in items for ch. 9Define these Key Terms:
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8experimenter's dilemma:the situation in which, generally speaking, the greater the internal validity of anexperiment, the lower its external validity, and vice versa.
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Psychology, researcher, Districts of Vienna, Repeated measures design, participants