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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 ... locked icon Sign in to access this contentSign in Get a 30 day FREE TRIAL
sign up today! 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? Get answer to your question and much more 34. Why must error variance be minimized in an experiment? Get answer to your question and much more 36. The “experimenter’s dilemma” refers to the trade-off between Get answer to your question and much more We have textbook solutions for you! The document you are viewing contains questions related to this textbook. Understanding Statistics in the Behavioral Sciences Pagano Expert Verified 7c.internal and external validityd. treatment and error varianceAnswers to multiple choice above from ch. 9 Get answer to your question and much more 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: Get answer to your question and much more 8experimenter's dilemma:the situation in which, generally speaking, the greater the internal validity of anexperiment, the lower its external validity, and vice versa. Upload your study docs or become a Course Hero member to access this document Upload your study docs or become a Course Hero member to access this document End of preview. Want to read all 15 pages? Upload your study docs or become a Course Hero member to access this document Tags Psychology, researcher, Districts of Vienna, Repeated measures design, participants Does attrition affect internal validity?' ' Attrition not only has potential to harm a study's external validity, but also may affect the internal validity of results. Internal validity depends on a researcher's capacity to rule out the effects of superfluous variables when interpreting groups' differences on an outcome variable.
What is a time related threat to internal validity for a within subjects experiment?Correct Answer : The major time-related factors that threaten within-subjects designs are history, instrumentation, maturation, and regression toward the mean. In each case, an outside factor can cause the participants' scores to change from one treatment to the next.
Which of the following threatens the internal validity of an experiment?What are threats to internal validity? There are eight threats to internal validity: history, maturation, instrumentation, testing, selection bias, regression to the mean, social interaction and attrition.
Which is a possible solution for an attrition threat to internal validity?It is easier to prevent attrition threats. This can be done by removing the participants scores from the pretest data as well. They could also simply check their scores for extremity.
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