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Answers to Study Questions for Chapter 10 Don t forget that the companion website also has multiple choice questions that you can take for practice You will find them here http www southalabama edu coe bset johnson dr johnson 2mcq htm 10 1 What is a quasi experimental design and when do you use such a design Quasi experimental research designs are experimental designs that do not provide for full control of extraneous variables primarily because of the lack of random assignment to groups They are stronger than the three weak designs discussed in the last chapter but they are not as strong as the five strong designs that we discussed in the last chapter You could say that they are kind of in between designs they are not great but they are not too bad either Because they are classified as a type of experimental research the independent variable must manipulated although real world events that are highly similar to experimenter manipulation also may be appropriate for quasi experimental research You can view quasi experiments as falling in the center of a continuum with weak experimental designs on the far left side and strong experimental designs on the far right side In other words quasi designs are not the worst and they are not the best They are in between or moderately strong designs Weak Quasi Strong Designs Designs Designs 10 2 Quasi experimental research designs are used when a you are interested in studying cause and effect b you can manipulate the independent variable c you are not able to use a stronger experimental design because of practical or other constraints What requirements must be met to reach a valid causal inference when using a quasi experimental design Basically you must meet the same three necessary conditions that we discussed in the last chapter Here are these extremely important conditions again presented in a Table from a later chapter in your book Again whenever you are trying to establish a cause and effect relationship as being present



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